diff --git a/platform/chromium/vapi-background.js b/platform/chromium/vapi-background.js
index 077211831..9a5f4f0b3 100644
--- a/platform/chromium/vapi-background.js
+++ b/platform/chromium/vapi-background.js
@@ -1010,6 +1010,7 @@ vAPI.messaging = {
         case 'extendClient':
             vAPI.tabs.executeScript(tabId, {
                 file: '/js/vapi-client-extra.js',
+                frameId: portDetails.frameId,
             }).then(( ) => {
                 callback();
             });
diff --git a/src/_locales/en/messages.json b/src/_locales/en/messages.json
index 84dee24e9..5179f0af5 100644
--- a/src/_locales/en/messages.json
+++ b/src/_locales/en/messages.json
@@ -1027,6 +1027,10 @@
     "message": "bytes",
     "description": ""
   },
+  "contextMenuBlockElementInFrame": {
+    "message": "Block element in frame...",
+    "description": "An entry in the browser's contextual menu"
+  },
   "contextMenuTemporarilyAllowLargeMediaElements": {
     "message": "Temporarily allow large media elements",
     "description": "A context menu entry, present when large media elements have been blocked on the current site"
diff --git a/src/css/epicker-ui.css b/src/css/epicker-ui.css
index c57146297..c8759f2ac 100644
--- a/src/css/epicker-ui.css
+++ b/src/css/epicker-ui.css
@@ -15,16 +15,18 @@ html#ublock0-epicker,
 #ublock0-epicker aside {
     background-color: var(--default-surface);
     border: 1px solid var(--default-surface-border);
-    bottom: 4px;
+    bottom: 2px;
     box-sizing: border-box;
     cursor: default;
     display: none;
+    max-height: calc(100vh - 4px);
     max-width: 36rem;
     min-width: 24rem;
+    overflow-y: auto;
     padding: 4px;
     position: fixed;
-    right: 4px;
-    width: calc(40% - 4px);
+    right: 2px;
+    width: calc(40% - 2px);
 }
 #ublock0-epicker.paused:not(.zap) aside {
     display: block;
@@ -89,6 +91,8 @@ html#ublock0-epicker,
     box-sizing: border-box;
     font: 11px monospace;
     height: 8em;
+    max-height: 50vh;
+    min-height: 1em;
     padding: 2px;
     width: 100%;
     }
diff --git a/src/js/commands.js b/src/js/commands.js
index f99c0bf8c..c30b8627b 100644
--- a/src/js/commands.js
+++ b/src/js/commands.js
@@ -165,6 +165,7 @@ vAPI.commands.onCommand.addListener(async command => {
         µb.epickerArgs.mouse = false;
         µb.elementPickerExec(
             tab.id,
+            0,
             undefined,
             command === 'launch-element-zapper'
         );
diff --git a/src/js/contextmenu.js b/src/js/contextmenu.js
index 7ac5b2d4b..80b2ed7a7 100644
--- a/src/js/contextmenu.js
+++ b/src/js/contextmenu.js
@@ -58,7 +58,16 @@ const onBlockElement = function(details, tab) {
     }
 
     µBlock.epickerArgs.mouse = true;
-    µBlock.elementPickerExec(tab.id, tagName + '\t' + src);
+    µBlock.elementPickerExec(tab.id, 0, `${tagName}\t${src}`);
+};
+
+/******************************************************************************/
+
+const onBlockElementInFrame = function(details, tab) {
+    if ( tab === undefined ) { return; }
+    if ( /^https?:\/\//.test(details.frameUrl) === false ) { return; }
+    µBlock.epickerArgs.mouse = false;
+    µBlock.elementPickerExec(tab.id, details.frameId);
 };
 
 /******************************************************************************/
@@ -76,6 +85,9 @@ const onEntryClicked = function(details, tab) {
     if ( details.menuItemId === 'uBlock0-blockElement' ) {
         return onBlockElement(details, tab);
     }
+    if ( details.menuItemId === 'uBlock0-blockElementInFrame' ) {
+        return onBlockElementInFrame(details, tab);
+    }
     if ( details.menuItemId === 'uBlock0-temporarilyAllowLargeMediaElements' ) {
         return onTemporarilyAllowLargeMediaElements(details, tab);
     }
@@ -83,18 +95,23 @@ const onEntryClicked = function(details, tab) {
 
 /******************************************************************************/
 
-const menuEntries = [
-    {
+const menuEntries = {
+    blockElement: {
         id: 'uBlock0-blockElement',
         title: vAPI.i18n('pickerContextMenuEntry'),
         contexts: ['all'],
     },
-    {
+    blockElementInFrame: {
+        id: 'uBlock0-blockElementInFrame',
+        title: vAPI.i18n('contextMenuBlockElementInFrame'),
+        contexts: ['frame'],
+    },
+    temporarilyAllowLargeMediaElements: {
         id: 'uBlock0-temporarilyAllowLargeMediaElements',
         title: vAPI.i18n('contextMenuTemporarilyAllowLargeMediaElements'),
         contexts: ['all'],
     }
-];
+};
 
 /******************************************************************************/
 
@@ -115,10 +132,11 @@ const update = function(tabId = undefined) {
     currentBits = newBits;
     let usedEntries = [];
     if ( newBits & 0x01 ) {
-        usedEntries.push(menuEntries[0]);
+        usedEntries.push(menuEntries.blockElement);
+        usedEntries.push(menuEntries.blockElementInFrame);
     }
     if ( newBits & 0x02 ) {
-        usedEntries.push(menuEntries[1]);
+        usedEntries.push(menuEntries.temporarilyAllowLargeMediaElements);
     }
     vAPI.contextMenu.setEntries(usedEntries, onEntryClicked);
 };
diff --git a/src/js/epicker-ui.js b/src/js/epicker-ui.js
index 7c8df0974..5b6f73a4a 100644
--- a/src/js/epicker-ui.js
+++ b/src/js/epicker-ui.js
@@ -599,8 +599,8 @@ const onStartMoving = (( ) => {
 
     const move = ( ) => {
         timer = undefined;
-        const r1 = Math.min(Math.max(r0 - mx1 + mx0, 4), rMax);
-        const b1 = Math.min(Math.max(b0 - my1 + my0, 4), bMax);
+        const r1 = Math.min(Math.max(r0 - mx1 + mx0, 2), rMax);
+        const b1 = Math.min(Math.max(b0 - my1 + my0, 2), bMax);
         dialog.style.setProperty('right', `${r1}px`);
         dialog.style.setProperty('bottom', `${b1}px`);
     };
@@ -646,8 +646,8 @@ const onStartMoving = (( ) => {
         r0 = parseInt(style.right, 10);
         b0 = parseInt(style.bottom, 10);
         const rect = dialog.getBoundingClientRect();
-        rMax = pickerRoot.clientWidth - 4 - rect.width ;
-        bMax = pickerRoot.clientHeight - 4 - rect.height;
+        rMax = pickerRoot.clientWidth - 2 - rect.width ;
+        bMax = pickerRoot.clientHeight - 2 - rect.height;
         dialog.classList.add('moving');
         if ( isTouch ) {
             self.addEventListener('touchmove', moveAsync, { capture: true });
diff --git a/src/js/messaging.js b/src/js/messaging.js
index c8c175165..b8e8cdf32 100644
--- a/src/js/messaging.js
+++ b/src/js/messaging.js
@@ -154,7 +154,7 @@ const onMessage = function(request, sender, callback) {
     case 'launchElementPicker':
         // Launched from some auxiliary pages, clear context menu coords.
         µb.epickerArgs.mouse = false;
-        µb.elementPickerExec(request.tabId, request.targetURL, request.zap);
+        µb.elementPickerExec(request.tabId, 0, request.targetURL, request.zap);
         break;
 
     case 'gotoURL':
diff --git a/src/js/ublock.js b/src/js/ublock.js
index 1a0c0ac82..bc765036f 100644
--- a/src/js/ublock.js
+++ b/src/js/ublock.js
@@ -414,7 +414,12 @@ const matchBucket = function(url, hostname, bucket, start) {
 
 /******************************************************************************/
 
-µBlock.elementPickerExec = async function(tabId, targetElement, zap = false) {
+µBlock.elementPickerExec = async function(
+    tabId,
+    frameId,
+    targetElement,
+    zap = false,
+) {
     if ( vAPI.isBehindTheSceneTabId(tabId) ) { return; }
 
     this.epickerArgs.target = targetElement || '';
@@ -422,13 +427,16 @@ const matchBucket = function(url, hostname, bucket, start) {
 
     // https://github.com/uBlockOrigin/uBlock-issues/issues/40
     //   The element picker needs this library
-    vAPI.tabs.executeScript(tabId, {
-        file: '/lib/diff/swatinem_diff.js',
-        runAt: 'document_end',
-    });
+    if ( zap !== true ) {
+        vAPI.tabs.executeScript(tabId, {
+            file: '/lib/diff/swatinem_diff.js',
+            runAt: 'document_end',
+        });
+    }
 
     await vAPI.tabs.executeScript(tabId, {
         file: '/js/scriptlets/epicker.js',
+        frameId,
         runAt: 'document_end',
     });