diff --git a/src/_locales/en/messages.json b/src/_locales/en/messages.json
index abb08357d..112ab8449 100644
--- a/src/_locales/en/messages.json
+++ b/src/_locales/en/messages.json
@@ -459,6 +459,10 @@
     "message":"even if",
     "description":"Used in the static filtering wizard"
   },
+  "loggerStaticFilteringFinderSentence1":{
+    "message":"Static filter {{filter}} found in:",
+    "description":"Below this sentence, the filter lists in which the filter was found"
+  },
   "aboutChangelog":{
     "message":"Change log",
     "description":"English: Change log"
diff --git a/src/background.html b/src/background.html
index b3d0820f3..5852880a9 100644
--- a/src/background.html
+++ b/src/background.html
@@ -29,6 +29,7 @@
 <script src="js/tab.js"></script>
 <script src="js/traffic.js"></script>
 <script src="js/contextmenu.js"></script>
+<script src="js/reverselookup.js"></script>
 <script src="js/start.js"></script>
 </body>
 </html>
diff --git a/src/css/logger-ui.css b/src/css/logger-ui.css
index 1980d6396..572fadd26 100644
--- a/src/css/logger-ui.css
+++ b/src/css/logger-ui.css
@@ -189,6 +189,9 @@ body:not(.popupOn) #content tr.canMtx td:nth-of-type(2) {
 body:not(.popupOn) #content tr.canMtx td:nth-of-type(2):hover {
     background: #ccc;
     }
+#content tr.cat_net[data-filter] td:nth-of-type(3) {
+    cursor: zoom-in;
+    }
 #content tr.cat_net td:nth-of-type(4),
 #content tr.cat_cosmetic td:nth-of-type(4) {
     font: 12px monospace;
@@ -275,7 +278,7 @@ body[dir="rtl"] #popupContainer > div {
     display: none;
     }
 
-#urlFilteringMenu {
+.modalDialog {
     background-color: rgba(0, 0, 0, 0.5);
     border: 0;
     bottom: 0;
@@ -287,9 +290,10 @@ body[dir="rtl"] #popupContainer > div {
     z-index: 400;
     }
 
-#urlFilteringMenu .dialog {
+.modalDialog .dialog {
     background-color: white;
     border: 2px solid white;
+    box-sizing: border-box;
     left: 10%;
     position: absolute;
     top: 50%;
@@ -298,11 +302,11 @@ body[dir="rtl"] #popupContainer > div {
     width: 80%;
     }
 
-#urlFilteringMenu .dialog p {
+#netFilteringDialog .dialog p {
     line-height: 2em;
     }
 
-#urlFilteringMenu .dialog select {
+#netFilteringDialog .dialog select {
     appearance: none;
     -webkit-appearance: none;
     -moz-appearance: none;
@@ -313,7 +317,7 @@ body[dir="rtl"] #popupContainer > div {
     padding: 0.2em;
 }
 
-#urlFilteringMenu .dialog > div.preview {
+#netFilteringDialog .dialog > div.preview {
     /* http://lea.verou.me/css3patterns/ */
     background-color: #aaa;
     background-image:
@@ -337,33 +341,33 @@ body[dir="rtl"] #popupContainer > div {
     background-size: 18px 18px;
     text-align: center;
     }
-#urlFilteringMenu .dialog > div.preview > * {
+#netFilteringDialog .dialog > div.preview > * {
     max-width: 100%;
     max-height: 40vh;
     }
 
-#urlFilteringMenu .dialog table {
+#netFilteringDialog .dialog table {
     border: 0;
     border-collapse: collapse;
     table-layout: fixed;
     width: 100%;
     }
-#urlFilteringMenu .dialog table > colgroup > col:nth-of-type(1) {
+#netFilteringDialog .dialog table > colgroup > col:nth-of-type(1) {
     width: 3.8em;
     }
-#urlFilteringMenu .dialog table > colgroup > col:nth-of-type(2) {
+#netFilteringDialog .dialog table > colgroup > col:nth-of-type(2) {
     }
 
-#urlFilteringMenu .dialog td {
+#netFilteringDialog .dialog td {
     border: 0;
     padding: 0;
     vertical-align: middle;
     }
-#urlFilteringMenu .dialog > div.headers {
+#netFilteringDialog .dialog > div.headers {
     border-bottom: 1px solid #888;
     position: relative;
     }
-#urlFilteringMenu .dialog > div.headers > span.header {
+#netFilteringDialog .dialog > div.headers > span.header {
     background-color: #eee;
     border: 1px solid #aaa;
     border-bottom: 1px solid #888;
@@ -380,45 +384,45 @@ body[dir="rtl"] #popupContainer > div {
     text-align: center;
     top: 1px;
     }
-#urlFilteringMenu .dialog > div.headers > span.header.selected {
+#netFilteringDialog .dialog > div.headers > span.header.selected {
     background-color: white;
     border-color: #888;
     border-bottom: 1px solid white;
     color: black;
     }
-#urlFilteringMenu .dialog > div.headers > span.tools {
+#netFilteringDialog .dialog > div.headers > span.tools {
     display: inline-block;
     position: absolute;
     top: 50%;
     transform: translate(0, -50%);
     }
-body[dir="ltr"] #urlFilteringMenu .dialog > div.headers > span.tools {
+body[dir="ltr"] #netFilteringDialog .dialog > div.headers > span.tools {
     right: 0.1em;
     }
-body[dir="rtl"] #urlFilteringMenu .dialog > div.headers > span.tools {
+body[dir="rtl"] #netFilteringDialog .dialog > div.headers > span.tools {
     left: 0.1em;
     }
-#urlFilteringMenu .dialog > div.headers > span.tools > span {
+#netFilteringDialog .dialog > div.headers > span.tools > span {
     cursor: pointer;
     font-size: 1.2em;
     text-align: center;
     }
-#urlFilteringMenu .dialog > div.containers {
+#netFilteringDialog .dialog > div.containers {
     height: 40vh;
     overflow: hidden;
     overflow-y: auto;
     }
-#urlFilteringMenu .dialog > div.containers > div {
+#netFilteringDialog .dialog > div.containers > div {
     display: none;
     }
-#urlFilteringMenu .dialog > div.containers > div.selected {
+#netFilteringDialog .dialog > div.containers > div.selected {
     display: block;
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic > table.toolbar select {
+#netFilteringDialog .dialog > div.containers > div.dynamic > table.toolbar select {
     font: 14px;
     height: 2em;
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic > table.toolbar #saveRules {
+#netFilteringDialog .dialog > div.containers > div.dynamic > table.toolbar #saveRules {
     background-color: #ffe;
     border: 1px solid #ddc;
     border-radius: 4px;
@@ -428,37 +432,37 @@ body[dir="rtl"] #urlFilteringMenu .dialog > div.headers > span.tools {
     padding: 0.25em 0.5em;
     visibility: hidden;
     }
-body.dirty #urlFilteringMenu .dialog > div.containers > div.dynamic > table.toolbar #saveRules {
+body.dirty #netFilteringDialog .dialog > div.containers > div.dynamic > table.toolbar #saveRules {
     visibility: visible;
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic > table.toolbar #saveRules:hover {
+#netFilteringDialog .dialog > div.containers > div.dynamic > table.toolbar #saveRules:hover {
     color: black;
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic > table.toolbar tr.entry {
+#netFilteringDialog .dialog > div.containers > div.dynamic > table.toolbar tr.entry {
     display: none;
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry {
+#netFilteringDialog .dialog > div.containers > div.dynamic tr.entry {
     background-color: #e6e6e6;
     border: 0;
     border-bottom: 1px solid white;
     font-size: 13px;
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry:hover {
+#netFilteringDialog .dialog > div.containers > div.dynamic tr.entry:hover {
     background-color: #f0f0f0;
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td:first-of-type {
+#netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td:first-of-type {
     border: 0;
     border-right: 1px solid white;
     text-align: center;
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action {
+#netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action {
     background-color: transparent;
     border: 0;
     cursor: pointer;
     height: 2em;
     width: 100%;
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action > span {
+#netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action > span {
     background-color: transparent;
     border: 0;
     display: inline-block;
@@ -467,80 +471,98 @@ body.dirty #urlFilteringMenu .dialog > div.containers > div.dynamic > table.tool
     visibility: hidden;
     width: 33.33%;
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action.allow {
+#netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action.allow {
     background-color: rgba(0, 160, 0, 0.3);
     }
-body.colorBlind #urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action.allow {
+body.colorBlind #netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action.allow {
     background-color: rgba(255, 194, 57, 0.4);
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action.noop {
+#netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action.noop {
     background-color: rgba(108, 108, 108, 0.3);
     }
-body.colorBlind #urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action.noop {
+body.colorBlind #netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action.noop {
     background-color: rgba(96, 96, 96, 0.4);
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action.block {
+#netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action.block {
     background-color: rgba(192, 0, 0, 0.3);
     }
-body.colorBlind #urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action.block {
+body.colorBlind #netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action.block {
     background-color: rgba(0, 19, 110, 0.4);
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action.own.allow {
+#netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action.own.allow {
     background-color: rgba(0, 160, 0, 1);
     }
-body.colorBlind #urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action.own.allow {
+body.colorBlind #netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action.own.allow {
     background-color: rgba(255, 194, 57, 1);
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action.own.noop {
+#netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action.own.noop {
     background-color: rgba(108, 108, 108, 1);
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action.own.block {
+#netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action.own.block {
     background-color: rgba(192, 0, 0, 1);
     }
-body.colorBlind #urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action.own.block {
+body.colorBlind #netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action.own.block {
     background-color: rgba(0, 19, 110, 1);
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action:not(.own):hover > span {
+#netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action:not(.own):hover > span {
     opacity: 0.2;
     visibility: visible;
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action:not(.own):hover > span:hover {
+#netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action:not(.own):hover > span:hover {
     opacity: 0.75;
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action > span.allow {
+#netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action > span.allow {
     background-color: rgb(0, 160, 0);
     }
-body.colorBlind  #urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action > span.allow {
+body.colorBlind  #netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action > span.allow {
     background-color: rgb(255, 194, 57);
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action > span.noop {
+#netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action > span.noop {
     background-color: rgb(108, 108, 108);
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action > span.block {
+#netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action > span.block {
     background-color: rgb(192, 0, 0);
     }
-body.colorBlind  #urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td > div.action > span.block {
+body.colorBlind  #netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td > div.action > span.block {
     background-color: rgb(0, 19, 110);
     }
-#urlFilteringMenu .dialog > div.containers > div.dynamic tr.entry > td.url {
+#netFilteringDialog .dialog > div.containers > div.dynamic tr.entry > td.url {
     overflow: hidden;
     padding-left: 4px;
     text-overflow: ellipsis;
     white-space: nowrap;
     }
-#urlFilteringMenu .dialog > div.containers > div.static > p {
+#netFilteringDialog .dialog > div.containers > div.static > p {
     margin: 0.75em 0;
     }
-#urlFilteringMenu .dialog > div.containers > div.static textarea {
+#netFilteringDialog .dialog > div.containers > div.static textarea {
     box-sizing: border-box;
     direction: ltr;
     height: 6em;
     resize: none;
     width: 100%;
     }
-#urlFilteringMenu .dialog > div.containers > div.static > p:nth-of-type(2) {
+#netFilteringDialog .dialog > div.containers > div.static > p:nth-of-type(2) {
     text-align: center;
     }
+
+#filterFinderDialog .dialog {
+    padding: 1em;
+    }
+#filterFinderDialog .dialog code {
+    background: #eee;
+    padding: 3px;
+    }
+#filterFinderDialog .dialog ul {
+    font-size: larger;
+    }
+#filterFinderDialog .dialog > *:first-child {
+    margin-top: 0;
+    }
+#filterFinderDialog .dialog > *:last-child {
+    margin-bottom: 0;
+    }
+
 .hide {
     display: none;
     }
diff --git a/src/js/logger-ui.js b/src/js/logger-ui.js
index 0c7c7d5c3..dd239eb27 100644
--- a/src/js/logger-ui.js
+++ b/src/js/logger-ui.js
@@ -1,6 +1,6 @@
 /*******************************************************************************
 
-    uMatrix - a browser extension to benchmark browser session.
+    uBlock Origin - a browser extension to block requests.
     Copyright (C) 2015 Raymond Hill
 
     This program is free software: you can redistribute it and/or modify
@@ -16,7 +16,7 @@
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see {http://www.gnu.org/licenses/}.
 
-    Home: https://github.com/gorhill/sessbench
+    Home: https://github.com/gorhill/uBlock
 */
 
 /* jshint boss: true */
@@ -32,9 +32,9 @@
 
 // Adjust top padding of content table, to match that of toolbar height.
 
-document.getElementById('content').style.setProperty(
+uDom.nodeFromId('content').style.setProperty(
     'margin-top',
-    document.getElementById('toolbar').offsetHeight + 'px'
+    uDom.nodeFromId('toolbar').offsetHeight + 'px'
 );
 
 /******************************************************************************/
@@ -51,7 +51,8 @@ var allTabIds = {};
 var allTabIdsToken;
 var hiddenTemplate = document.querySelector('#hiddenTemplate > span');
 var reRFC3986 = /^([^:\/?#]+:)?(\/\/[^\/?#]*)?([^?#]*)(\?[^#]*)?(#.*)?/;
-var urlFilteringMenu = document.querySelector('#urlFilteringMenu');
+var netFilteringDialog = uDom.nodeFromId('netFilteringDialog');
+var filterFinderDialog = uDom.nodeFromId('filterFinderDialog');
 
 var prettyRequestTypes = {
     'main_frame': 'doc',
@@ -159,19 +160,19 @@ var filterDecompiler = (function() {
         var opts = [];
         var vfields = compiled.split('\v');
         var filter = '';
-        var bits = parseInt(vfields[1], 16) | 0;
+        var bits = parseInt(vfields[0], 16) | 0;
 
         if ( bits & 0x01 ) {
             filter += '@@';
         }
 
-        var fid = vfields[2] === '.' ? '.' : vfields[3];
-        var tfields = fid !== '.' ? vfields[4].split('\t') : [];
+        var fid = vfields[1] === '.' ? '.' : vfields[2];
+        var tfields = fid !== '.' ? vfields[3].split('\t') : [];
         var tfield0 = tfields[0];
 
         switch ( fid ) {
         case '.':
-            filter += '||' + vfields[3] + '^';
+            filter += '||' + vfields[2] + '^';
             break;
         case 'a':
         case 'ah':
@@ -258,14 +259,13 @@ var filterDecompiler = (function() {
 
     var toRegex = function(compiled) {
         var vfields = compiled.split('\v');
-        var fid = vfields[2] === '.' ? '.' : vfields[3];
-        var tfields = fid !== '.' ? vfields[4].split('\t') : [];
+        var fid = vfields[1] === '.' ? '.' : vfields[2];
+        var tfields = fid !== '.' ? vfields[3].split('\t') : [];
         var reStr;
 
         switch ( fid ) {
         case '.':
-            reStr = vfields[3]
-                        .replace(reEscape, '\\$&');
+            reStr = vfields[2].replace(reEscape, '\\$&');
             break;
         case 'a':
         case 'ah':
@@ -343,6 +343,7 @@ var createRow = function(layout) {
         tr.className = '';
         tr.removeAttribute('data-hn-page');
         tr.removeAttribute('data-hn-frame');
+        tr.removeAttribute('data-filter');
     } else {
         tr = document.createElement('tr');
     }
@@ -431,6 +432,7 @@ var renderNetLogEntry = function(tr, entry) {
         filter = filter.slice(3);
         if ( filteringType === 's' ) {
             td.textContent = filterDecompiler.toString(filter);
+            tr.setAttribute('data-filter', filter);
         } else {
             td.textContent = filter;
         }
@@ -587,7 +589,7 @@ var synchronizeTabIds = function(newTabIds) {
         }
     }
 
-    var select = document.getElementById('pageSelector');
+    var select = uDom.nodeFromId('pageSelector');
     var selectValue = select.value;
     var tabIds = Object.keys(newTabIds).sort(function(a, b) {
         return newTabIds[a].localeCompare(newTabIds[b]);
@@ -692,8 +694,8 @@ var readLogBuffer = function() {
 /******************************************************************************/
 
 var pageSelectorChanged = function() {
-    var style = document.getElementById('tabFilterer');
-    var tabClass = document.getElementById('pageSelector').value;
+    var style = uDom.nodeFromId('tabFilterer');
+    var tabClass = uDom.nodeFromId('pageSelector').value;
     var sheet = style.sheet;
     while ( sheet.cssRules.length !== 0 )  {
         sheet.deleteRule(0);
@@ -713,7 +715,7 @@ var pageSelectorChanged = function() {
 /******************************************************************************/
 
 var reloadTab = function() {
-    var tabClass = document.getElementById('pageSelector').value;
+    var tabClass = uDom.nodeFromId('pageSelector').value;
     var tabId = tabIdFromClassName(tabClass);
     if ( tabId === 'bts' || tabId === '' ) {
         return;
@@ -746,7 +748,7 @@ var onMaxEntriesChanged = function() {
 /******************************************************************************/
 /******************************************************************************/
 
-var filteringDialog = (function() {
+var netFilteringManager = (function() {
     var targetRow = null;
     var dialog = null;
     var createdStaticFilters = {};
@@ -856,8 +858,8 @@ var filteringDialog = (function() {
     var onClick = function(ev) {
         var target = ev.target;
 
-        // click outside the url filtering menu
-        if ( target.id === 'urlFilteringMenu' ) {
+        // click outside the dialog proper
+        if ( target.classList.contains('modalDialog') ) {
             toggleOff();
             return;
         }
@@ -1217,14 +1219,14 @@ var filteringDialog = (function() {
         createPreview(targetType, targetURLs[0]);
         fillDynamicPane();
         fillStaticPane();
-        document.body.appendChild(urlFilteringMenu);
-        urlFilteringMenu.addEventListener('click', onClick, true);
-        urlFilteringMenu.addEventListener('change', onSelectChange, true);
-        urlFilteringMenu.addEventListener('input', onInputChange, true);
+        document.body.appendChild(netFilteringDialog);
+        netFilteringDialog.addEventListener('click', onClick, true);
+        netFilteringDialog.addEventListener('change', onSelectChange, true);
+        netFilteringDialog.addEventListener('input', onInputChange, true);
     };
 
     var toggleOn = function(ev) {
-        dialog = urlFilteringMenu.querySelector('.dialog');
+        dialog = netFilteringDialog.querySelector('.dialog');
         targetRow = ev.target.parentElement;
         targetTabId = tabIdFromClassName(targetRow.className);
         targetType = targetRow.cells[4].textContent.trim() || '';
@@ -1245,10 +1247,104 @@ var filteringDialog = (function() {
         dialog = null;
         targetRow = null;
         targetURLs = [];
-        urlFilteringMenu.removeEventListener('click', onClick, true);
-        urlFilteringMenu.removeEventListener('change', onSelectChange, true);
-        urlFilteringMenu.removeEventListener('input', onInputChange, true);
-        document.body.removeChild(urlFilteringMenu);
+        netFilteringDialog.removeEventListener('click', onClick, true);
+        netFilteringDialog.removeEventListener('change', onSelectChange, true);
+        netFilteringDialog.removeEventListener('input', onInputChange, true);
+        document.body.removeChild(netFilteringDialog);
+    };
+
+    return {
+        toggleOn: toggleOn
+    };
+})();
+
+/******************************************************************************/
+/******************************************************************************/
+
+var reverseLookupManager = (function() {
+    var rawFilter = '';
+    var reSentence1 = /\{\{filter\}\}/g;
+    var sentence1Template = vAPI.i18n('loggerStaticFilteringFinderSentence1');
+
+    var removeAllChildren = function(node) {
+        while ( node.firstChild ) {
+            node.removeChild(node.firstChild);
+        }
+    };
+
+    var onClick = function(ev) {
+        var target = ev.target;
+
+        // click outside the dialog proper
+        if ( target.classList.contains('modalDialog') ) {
+            toggleOff();
+            return;
+        }
+
+        ev.stopPropagation();
+    };
+
+    var reverseLookupDone = function(response) {
+        var lists = response.matches;
+        if ( Array.isArray(lists) === false ) {
+            return;
+        }
+
+        var dialog = filterFinderDialog.querySelector('.dialog');
+        var p = dialog.querySelector('p');
+        removeAllChildren(p);
+        var node;
+
+        reSentence1.lastIndex = 0;
+        var matches = reSentence1.exec(sentence1Template);
+        if ( matches === null ) {
+            node = document.createTextNode(sentence1Template);
+        } else {
+            node = uDom.nodeFromSelector('#filterFinderDialogSentence1 > span').cloneNode(true);
+            node.childNodes[0].textContent = sentence1Template.slice(0, matches.index);
+            node.childNodes[1].textContent = rawFilter;
+            node.childNodes[2].textContent = sentence1Template.slice(reSentence1.lastIndex);
+        }
+        p.appendChild(node);
+
+        var ul = dialog.querySelector('ul');
+        removeAllChildren(ul);
+        var list, li;
+        for ( var i = 0; i < lists.length; i++ ) {
+            list = lists[i];
+            li = document.createElement('li');
+            if ( list.supportURL ) {
+                node = document.createElement('a');
+                node.textContent = list.title;
+                node.setAttribute('href', list.supportURL);
+                node.setAttribute('target', '_blank');
+            } else {
+                node = document.createTextNode(list.title);
+            }
+            li.appendChild(node);
+            ul.appendChild(li);
+        }
+
+        document.body.appendChild(filterFinderDialog);
+        filterFinderDialog.addEventListener('click', onClick, true);
+    };
+
+    var toggleOn = function(ev) {
+        var row = ev.target.parentElement;
+        var filter = row.getAttribute('data-filter') || '';
+        if ( filter === '' ) {
+            return;
+        }
+        rawFilter = row.cells[2].textContent;
+        messager.send({
+            what: 'reverseLookupFilter',
+            filter: filter
+        }, reverseLookupDone);
+    };
+
+    var toggleOff = function() {
+        filterFinderDialog.removeEventListener('click', onClick, true);
+        document.body.removeChild(filterFinderDialog);
     };
 
     return {
@@ -1489,7 +1585,7 @@ var popupManager = (function() {
             realTabId = noTabId;
         }
 
-        container = document.getElementById('popupContainer');
+        container = uDom.nodeFromId('popupContainer');
 
         container.querySelector('div > span:nth-of-type(1)').addEventListener('click', toggleSize);
         container.querySelector('div > span:nth-of-type(2)').addEventListener('click', toggleOff);
@@ -1500,7 +1596,7 @@ var popupManager = (function() {
         popupObserver = new MutationObserver(resizePopup);
         container.appendChild(popup);
 
-        style = document.getElementById('popupFilterer');
+        style = uDom.nodeFromId('popupFilterer');
         style.textContent = styleTemplate.replace('{{tabId}}', localTabId);
 
         document.body.classList.add('popupOn');
@@ -1559,7 +1655,8 @@ uDom.onLoad(function() {
     uDom('#clear').on('click', clearBuffer);
     uDom('#maxEntries').on('change', onMaxEntriesChanged);
     uDom('#content table').on('click', 'tr.canMtx > td:nth-of-type(2)', popupManager.toggleOn);
-    uDom('#content').on('click', 'tr.cat_net > td:nth-of-type(4)', filteringDialog.toggleOn);
+    uDom('#content').on('click', 'tr.cat_net > td:nth-of-type(4)', netFilteringManager.toggleOn);
+    uDom('#content').on('click', 'tr[data-filter] > td:nth-of-type(3)', reverseLookupManager.toggleOn);
 });
 
 /******************************************************************************/
diff --git a/src/js/messaging.js b/src/js/messaging.js
index 174a965c4..2c0d9649c 100644
--- a/src/js/messaging.js
+++ b/src/js/messaging.js
@@ -66,6 +66,10 @@ var onMessage = function(request, sender, callback) {
         µb.reloadAllFilters(callback);
         return;
 
+    case 'reverseLookupFilter':
+        µb.staticFilteringReverseLookup.lookup(request.filter, callback);
+        return;
+
     default:
         break;
     }
diff --git a/src/js/reverselookup-worker.js b/src/js/reverselookup-worker.js
new file mode 100644
index 000000000..f484633f9
--- /dev/null
+++ b/src/js/reverselookup-worker.js
@@ -0,0 +1,79 @@
+/*******************************************************************************
+
+    uBlock - a browser extension to block requests.
+    Copyright (C) 2015 Raymond Hill
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see {http://www.gnu.org/licenses/}.
+
+    Home: https://github.com/gorhill/uBlock
+*/
+
+/* global onmessage, postMessage */
+
+'use strict';
+
+/******************************************************************************/
+
+var listEntries = Object.create(null);
+
+/******************************************************************************/
+
+var lookup = function(details) {
+    var matches = [];
+    var entry, pos;
+    for ( var path in listEntries ) {
+        entry = listEntries[path];
+        if ( entry === undefined ) {
+            continue;
+        }
+        pos = entry.content.indexOf(details.filter);
+        if ( pos === -1 ) {
+            continue;
+        }
+        matches.push({
+            title: entry.title,
+            supportURL: entry.supportURL
+        });
+    }
+
+    postMessage({
+        id: details.id,
+        response: {
+            filter: details.filter,
+            matches: matches
+        }
+    });
+};
+
+/******************************************************************************/
+
+onmessage = function(e) {
+    var msg = e.data;
+
+    switch ( msg.what ) {
+    case 'resetLists':
+        listEntries = Object.create(null);
+        break;
+
+    case 'setList':
+        listEntries[msg.details.path] = msg.details;
+        break;
+
+    case 'reverseLookup':
+        lookup(msg);
+        break;
+    }
+};
+
+/******************************************************************************/
diff --git a/src/js/reverselookup.js b/src/js/reverselookup.js
new file mode 100644
index 000000000..e59ef3811
--- /dev/null
+++ b/src/js/reverselookup.js
@@ -0,0 +1,177 @@
+/*******************************************************************************
+
+    uBlock - a browser extension to block requests.
+    Copyright (C) 2015 Raymond Hill
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see {http://www.gnu.org/licenses/}.
+
+    Home: https://github.com/gorhill/uBlock
+*/
+
+/* global µBlock */
+
+/******************************************************************************/
+
+µBlock.staticFilteringReverseLookup = (function() {
+
+'use strict';
+
+/******************************************************************************/
+
+var worker = null;
+var workerTTL = 11 * 60 * 1000;
+var workerTTLTimer = null;
+var needLists = true;
+var messageId = 1;
+var pendingResponses = Object.create(null);
+
+/******************************************************************************/
+
+var onWorkerMessage = function(e) {
+    var msg = e.data;
+    var callback = pendingResponses[msg.id];
+    delete pendingResponses[msg.id];
+    callback(msg.response);
+};
+
+/******************************************************************************/
+
+var stopWorker = function() {
+    workerTTLTimer = null;
+    if ( worker === null ) {
+        return;
+    }
+    worker.terminate();
+    worker = null;
+    needLists = true;
+    pendingResponses = Object.create(null);
+};
+
+/******************************************************************************/
+
+var initWorker = function(callback) {
+    if ( worker === null ) {
+        worker = new Worker('js/reverselookup-worker.js');
+        worker.onmessage = onWorkerMessage;
+    }
+
+    if ( needLists === false ) {
+        callback();
+        return;
+    }
+
+    needLists = false;
+
+    var entries = Object.create(null);
+    var countdown = 0;
+    var path, entry;
+
+    var onListLoaded = function(details) {
+        var entry = entries[details.path];
+        worker.postMessage({
+            what: 'setList',
+            details: {
+                path: details.path,
+                title: entry.title || '',
+                supportURL: entry.supportURL,
+                content: details.content
+            }
+        });
+        countdown -= 1;
+        if ( countdown === 0 ) {
+            callback();
+        }
+    };
+
+    var µb = µBlock;
+
+    for ( path in µb.remoteBlacklists ) {
+        if ( µb.remoteBlacklists.hasOwnProperty(path) === false ) {
+            continue;
+        }
+        entry = µb.remoteBlacklists[path];
+        if ( entry.off === true ) {
+            continue;
+        }
+        entries[path] = {
+            title: entry.title,
+            supportURL: entry.supportURL || ''
+        };
+        countdown += 1;
+    }
+
+    if ( countdown === 0 ) {
+        callback();
+        return;
+    }
+
+    for ( path in entries ) {
+        µb.getCompiledFilterList(path, onListLoaded);
+    }
+};
+
+/******************************************************************************/
+
+var lookup = function(compiledFilter, callback) {
+    if ( typeof callback !== 'function' ) {
+        return;
+    }
+
+    if ( workerTTLTimer !== null ) {
+        clearTimeout(workerTTLTimer);
+        workerTTLTimer = null;
+    }
+
+    var onWorkerReady = function() {
+        var id = messageId++;
+        var message = {
+            what: 'reverseLookup',
+            id: id,
+            filter: compiledFilter
+        };
+        pendingResponses[id] = callback;
+        worker.postMessage(message);
+
+        // The worker will be shutdown after n minutes without being used.
+        workerTTLTimer = vAPI.setTimeout(stopWorker, workerTTL);
+    };
+
+    initWorker(onWorkerReady);
+};
+
+/******************************************************************************/
+
+// This tells the worker that filter lists may have changed.
+
+var resetLists = function() {
+    needLists = true;
+    if ( worker === null ) {
+        return;
+    }
+    worker.postMessage({ what: 'resetLists' });
+};
+
+/******************************************************************************/
+
+return {
+    lookup: lookup,
+    resetLists: resetLists,
+    shutdown: stopWorker
+};
+
+/******************************************************************************/
+
+})();
+
+/******************************************************************************/
diff --git a/src/js/start.js b/src/js/start.js
index d148cca21..663ee1a3f 100644
--- a/src/js/start.js
+++ b/src/js/start.js
@@ -37,6 +37,18 @@ var µb = µBlock;
 
 /******************************************************************************/
 
+vAPI.app.onShutdown = function() {
+    µb.staticFilteringReverseLookup.shutdown();
+    µb.staticNetFilteringEngine.reset();
+    µb.sessionFirewall.reset();
+    µb.permanentFirewall.reset();
+    µb.permanentFirewall.reset();
+    µb.sessionURLFiltering.reset();
+    µb.permanentURLFiltering.reset();
+};
+
+/******************************************************************************/
+
 // Final initialization steps after all needed assets are in memory.
 // - Initialize internal state with maybe already existing tabs.
 // - Schedule next update operation.
diff --git a/src/js/static-net-filtering.js b/src/js/static-net-filtering.js
index 84cee8030..fa8c945a5 100644
--- a/src/js/static-net-filtering.js
+++ b/src/js/static-net-filtering.js
@@ -160,11 +160,6 @@ histogram = function(label, categories) {
 
 // Local helpers
 
-// Could be replaced with encodeURIComponent/decodeURIComponent,
-// which seems faster on Firefox.
-var encode = JSON.stringify;
-var decode = JSON.parse;
-
 var cachedParseInt = parseInt;
 
 var atoi = function(s) {
@@ -1651,12 +1646,10 @@ FilterContainer.prototype.toSelfie = function() {
     var categoryToSelfie = function(dict) {
         var selfie = [];
         var bucket, ff, n, i, f;
-        for ( var k in dict ) {
+        for ( var token in dict ) {
             // No need for hasOwnProperty() here: there is no prototype chain.
-            // We need to encode the key because there could be a `\n` or '\t'
-            // character in it, which would trip the code at parse time.
-            selfie.push('k2\t' + encode(k));
-            bucket = dict[k];
+            selfie.push('k2\t' + token);
+            bucket = dict[token];
             selfie.push(bucket.fid + '\t' + bucket.toSelfie());
             if ( bucket.fid !== '[]' ) {
                 continue;
@@ -1673,12 +1666,10 @@ FilterContainer.prototype.toSelfie = function() {
 
     var categoriesToSelfie = function(dict) {
         var selfie = [];
-        for ( var k in dict ) {
+        for ( var key in dict ) {
             // No need for hasOwnProperty() here: there is no prototype chain.
-            // We need to encode the key because there could be a `\n` or '\t'
-            // character in it, which would trip the code at parse time.
-            selfie.push('k1\t' + encode(k));
-            selfie.push(categoryToSelfie(dict[k]));
+            selfie.push('k1\t' + key);
+            selfie.push(categoryToSelfie(dict[key]));
         }
         return selfie.join('\n');
     };
@@ -1722,13 +1713,13 @@ FilterContainer.prototype.fromSelfie = function(selfie) {
         pos = line.indexOf('\t');
         what = line.slice(0, pos);
         if ( what === 'k1' ) {
-            catKey = decode(line.slice(pos + 1));
+            catKey = line.slice(pos + 1);
             subdict = dict[catKey] = Object.create(null);
             bucket = null;
             continue;
         }
         if ( what === 'k2' ) {
-            tokenKey = decode(line.slice(pos + 1));
+            tokenKey = line.slice(pos + 1);
             bucket = null;
             continue;
         }
@@ -2015,18 +2006,18 @@ FilterContainer.prototype.filterStringFromCompiled = function(compiled) {
     var opts = [];
     var vfields = compiled.split('\v');
     var filter = '';
-    var bits = parseInt(vfields[1], 16) | 0;
+    var bits = parseInt(vfields[0], 16) | 0;
 
     if ( bits & 0x01 ) {
         filter += '@@';
     }
 
-    var rfid = vfields[2] === '.' ? '.' : vfields[3];
-    var tfields = rfid !== '.' ? vfields[4].split('\t') : [];
+    var rfid = vfields[1] === '.' ? '.' : vfields[2];
+    var tfields = rfid !== '.' ? vfields[3].split('\t') : [];
 
     switch ( rfid ) {
     case '.':
-        filter += '||' + vfields[3] + '^';
+        filter += '||' + vfields[2] + '^';
         break;
     case 'a':
     case 'ah':
@@ -2102,13 +2093,13 @@ FilterContainer.prototype.filterStringFromCompiled = function(compiled) {
 
 FilterContainer.prototype.filterRegexFromCompiled = function(compiled, flags) {
     var vfields = compiled.split('\v');
-    var rfid = vfields[2] === '.' ? '.' : vfields[3];
-    var tfields = rfid !== '.' ? vfields[4].split('\t') : [];
+    var rfid = vfields[1] === '.' ? '.' : vfields[2];
+    var tfields = rfid !== '.' ? vfields[3].split('\t') : [];
     var re = null;
 
     switch ( rfid ) {
     case '.':
-        re = strToRegex(vfields[3], 0, flags);
+        re = strToRegex(vfields[2], 0, flags);
         break;
     case 'a':
     case 'ah':
@@ -2476,7 +2467,7 @@ FilterContainer.prototype.toResultString = function(verbose) {
     if ( !verbose ) {
         return s;
     }
-    s += 'n\v' + this.keyRegister + '\v' + this.tokenRegister + '\v';
+    s += this.keyRegister + '\v' + this.tokenRegister + '\v';
     if ( this.tokenRegister === '.' ) {
         s += this.fRegister.rtCompile();
     } else {
diff --git a/src/js/storage.js b/src/js/storage.js
index f9e7a0541..172cc664d 100644
--- a/src/js/storage.js
+++ b/src/js/storage.js
@@ -400,6 +400,7 @@
         µb.cosmeticFilteringEngine.reset();
         µb.staticNetFilteringEngine.reset();
         µb.destroySelfie();
+        µb.staticFilteringReverseLookup.resetLists();
 
         // We need to build a complete list of assets to pull first: this is
         // because it *may* happens that some load operations are synchronous:
diff --git a/src/logger-ui.html b/src/logger-ui.html
index 0e9246112..a32392628 100644
--- a/src/logger-ui.html
+++ b/src/logger-ui.html
@@ -41,7 +41,7 @@
 <div id="templates" style="display: none;">
     <div id="renderedURLTemplate"><span><span></span><b></b><span></span></span></div>
     <div id="hiddenTemplate"><span style="display:none;"></span></div>
-    <div id="urlFilteringMenu">
+    <div id="netFilteringDialog" class="modalDialog">
         <div class="dialog">
             <div class="hide preview"></div>
             <div class="headers">
@@ -79,6 +79,13 @@
             </div>
         </div>
     </div>
+    <div id="filterFinderDialog" class="modalDialog">
+        <div class="dialog">
+            <p></p>
+            <ul></ul>
+        </div>
+    </div>
+    <div id="filterFinderDialogSentence1"><span><span></span><code></code><span></span></span></div>
 </div>
 
 <script src="js/vapi-common.js"></script>