diff --git a/src/about.html b/src/about.html
index 13c40ced4..9e367503e 100644
--- a/src/about.html
+++ b/src/about.html
@@ -40,6 +40,11 @@
         <div class="li"><span><a href="https://fontawesome.com/" target="_blank">FontAwesome font family</a> by <a href="https://github.com/davegandy">Dave Gandy</a></span></div>
         <div class="li"><span><a href="https://github.com/Swatinem/diff" target="_blank">An implementation of Myers' diff algorithm</a> by <a href="https://github.com/Swatinem">Arpad Borsos</a></span></div>
     </div>
+    <hr>
+    <div id="dev">
+        <button id="sfneBenchmark">Benchmark static filtering engine</button>
+        <div id="sfneBenchmarkResult"></div>
+    </div>
 </div>
 
 <script src="js/vapi.js"></script>
diff --git a/src/css/about.css b/src/css/about.css
index b32bcc811..181825873 100644
--- a/src/css/about.css
+++ b/src/css/about.css
@@ -9,3 +9,16 @@ body {
 .entry {
     margin: 0.5em 0;
     }
+#dev {
+    align-items: flex-start;
+    display: none;
+    }
+#dev.enabled {
+    display: flex;
+    }
+#dev > * {
+    margin-inline-end: 1em;
+    }
+#dev > div {
+    white-space: pre;
+    }
diff --git a/src/js/about.js b/src/js/about.js
index e4405c90a..b2e3d98c4 100644
--- a/src/js/about.js
+++ b/src/js/about.js
@@ -36,5 +36,20 @@
     const appData = await vAPI.messaging.send('dashboard', {
         what: 'getAppData',
     });
+
     uDom('#aboutNameVer').text(appData.name + ' v' + appData.version);
+
+    if ( appData.canBenchmark !== true ) { return; }
+
+    document.getElementById('dev').classList.add('enabled');
+
+    const sfneBenchmark = async ( ) => {
+        const result = await vAPI.messaging.send('dashboard', {
+            what: 'sfneBenchmark',
+        });
+        document.getElementById('sfneBenchmarkResult').textContent = result;
+    };
+    document.getElementById('sfneBenchmark').addEventListener('click', ( ) => {
+        sfneBenchmark();
+    });
 })();
diff --git a/src/js/cosmetic-filtering.js b/src/js/cosmetic-filtering.js
index 8156b9649..91155a627 100644
--- a/src/js/cosmetic-filtering.js
+++ b/src/js/cosmetic-filtering.js
@@ -1084,7 +1084,9 @@ FilterContainer.prototype.retrieveSpecificSelectors = function(
     if ( injectedHideFilters.length !== 0 ) {
         out.injectedHideFilters = injectedHideFilters.join(',\n');
         details.code = out.injectedHideFilters + '\n{display:none!important;}';
-        vAPI.tabs.insertCSS(request.tabId, details);
+        if ( options.dontInject !== true ) {
+            vAPI.tabs.insertCSS(request.tabId, details);
+        }
     }
 
     // CSS selectors for collapsible blocked elements
@@ -1093,7 +1095,9 @@ FilterContainer.prototype.retrieveSpecificSelectors = function(
         cacheEntry.retrieve('net', networkFilters);
         if ( networkFilters.length !== 0 ) {
             details.code = networkFilters.join('\n') + '\n{display:none!important;}';
-            vAPI.tabs.insertCSS(request.tabId, details);
+            if ( options.dontInject !== true ) {
+                vAPI.tabs.insertCSS(request.tabId, details);
+            }
         }
     }
 
@@ -1125,12 +1129,13 @@ FilterContainer.prototype.benchmark = async function() {
     const options = {
         noCosmeticFiltering: false,
         noGenericCosmeticFiltering: false,
+        dontInject: true,
     };
     let count = 0;
     const t0 = self.performance.now();
     for ( let i = 0; i < requests.length; i++ ) {
         const request = requests[i];
-        if ( request.cpt !== 'document' ) { continue; }
+        if ( request.cpt !== 'main_frame' ) { continue; }
         count += 1;
         details.hostname = µb.URI.hostnameFromURI(request.url);
         details.domain = µb.URI.domainFromHostname(details.hostname);
diff --git a/src/js/messaging.js b/src/js/messaging.js
index 806845c7c..f3c57fdd4 100644
--- a/src/js/messaging.js
+++ b/src/js/messaging.js
@@ -97,6 +97,12 @@ const onMessage = function(request, sender, callback) {
         µb.scriptlets.inject(request.tabId, request.scriptlet, callback);
         return;
 
+    case 'sfneBenchmark':
+        µb.staticNetFilteringEngine.benchmark().then(result => {
+            callback(result);
+        });
+        return;
+
     default:
         break;
     }
@@ -127,7 +133,8 @@ const onMessage = function(request, sender, callback) {
     case 'getAppData':
         response = {
             name: browser.runtime.getManifest().name,
-            version: vAPI.app.version
+            version: vAPI.app.version,
+            canBenchmark: µb.hiddenSettings.benchmarkDatasetURL !== 'unset',
         };
         break;
 
diff --git a/src/js/scriptlet-filtering.js b/src/js/scriptlet-filtering.js
index 3edb53b42..c05341935 100644
--- a/src/js/scriptlet-filtering.js
+++ b/src/js/scriptlet-filtering.js
@@ -432,7 +432,7 @@
         const t0 = self.performance.now();
         for ( let i = 0; i < requests.length; i++ ) {
             const request = requests[i];
-            if ( request.cpt !== 'document' ) { continue; }
+            if ( request.cpt !== 'main_frame' ) { continue; }
             count += 1;
             details.url = request.url;
             details.hostname = µb.URI.hostnameFromURI(request.url);
diff --git a/src/js/static-net-filtering.js b/src/js/static-net-filtering.js
index 57b97fad4..fe9211cd7 100644
--- a/src/js/static-net-filtering.js
+++ b/src/js/static-net-filtering.js
@@ -3544,12 +3544,14 @@ FilterContainer.prototype.benchmark = async function(action, target) {
     }
 
     const t0 = self.performance.now();
+    let matchCount = 0;
     for ( let i = 0; i < requests.length; i++ ) {
         const request = requests[i];
         fctxt.setURL(request.url);
         fctxt.setDocOriginFromURL(request.frameUrl);
         fctxt.setType(request.cpt);
         const r = this.matchString(fctxt);
+        matchCount += 1;
         if ( recorded !== undefined ) { recorded.push(r); }
         if ( expected !== undefined && r !== expected[i] ) {
             print(`Mismatch with reference results at ${i}:`);
@@ -3558,22 +3560,35 @@ FilterContainer.prototype.benchmark = async function(action, target) {
             print(`\turl=${fctxt.url}`);
             print(`\tdocOrigin=${fctxt.getDocOrigin()}`);
         }
+        if ( fctxt.type === 'main_frame' || fctxt.type === 'sub_frame' ) {
+            this.matchAndFetchData(fctxt, 'csp');
+            matchCount += 1;
+        }
     }
     const t1 = self.performance.now();
     const dur = t1 - t0;
 
-    print(`Evaluated ${requests.length} requests in ${dur.toFixed(0)} ms`);
-    print(`\tAverage: ${(dur / requests.length).toFixed(3)} ms per request`);
-    if ( expected !== undefined ) {
-        print(`\tBlocked: ${expected.reduce((n,r)=>{return r===1?n+1:n;},0)}`);
-        print(`\tExcepted: ${expected.reduce((n,r)=>{return r===2?n+1:n;},0)}`);
-    }
     if ( recorded !== undefined ) {
         vAPI.localStorage.setItem(
             'FilterContainer.benchmark.results',
             JSON.stringify(recorded)
         );
     }
+
+    const output = [
+        'Benchmarked static network filtering engine:',
+        `\tEvaluated ${matchCount} match calls in ${dur.toFixed(0)} ms`,
+        `\tAverage: ${(dur / matchCount).toFixed(3)} ms per request`,
+    ];
+    if ( expected !== undefined ) {
+        output.push(
+            `\tBlocked: ${expected.reduce((n,r)=>{return r===1?n+1:n;},0)}`,
+            `\tExcepted: ${expected.reduce((n,r)=>{return r===2?n+1:n;},0)}`,
+        );
+    }
+    const s = output.join('\n');
+    print(s);
+    return s;
 };
 
 /******************************************************************************/
diff --git a/src/js/utils.js b/src/js/utils.js
index 9bb0da4ac..83bc19e03 100644
--- a/src/js/utils.js
+++ b/src/js/utils.js
@@ -819,6 +819,11 @@
                 }
                 if ( request instanceof Object === false ) { continue; }
                 if ( !request.frameUrl || !request.url ) { continue; }
+                if ( request.cpt === 'document' ) {
+                    request.cpt = 'main_frame';
+                } else if ( request.cpt === 'xhr' ) {
+                    request.cpt = 'xmlhttprequest';
+                }
                 requests.push(request);
             }
             return requests;