diff --git a/platform/mv3/extension/js/background.js b/platform/mv3/extension/js/background.js
index d2ab2c38f..272ba4956 100644
--- a/platform/mv3/extension/js/background.js
+++ b/platform/mv3/extension/js/background.js
@@ -53,6 +53,10 @@ import {
     syncWithBrowserPermissions,
 } from './mode-manager.js';
 
+import {
+    ubolLog,
+} from './utils.js';
+
 /******************************************************************************/
 
 const rulesetConfig = {
@@ -169,6 +173,28 @@ async function onPermissionsRemoved() {
 
 function onMessage(request, sender, callback) {
 
+    // Does not require trusted origin.
+
+    switch ( request.what ) {
+
+    case 'insertCSS': {
+        const tabId = sender?.tab?.id ?? false;
+        const frameId = sender?.frameId ?? false;
+        if ( tabId === false || frameId === false ) { return; }
+        browser.scripting.insertCSS({
+            css: request.css,
+            origin: 'USER',
+            target: { tabId, frameIds: [ frameId ] },
+        });
+        return;
+    }
+
+    default:
+        break;
+    }
+
+    // Does requires trusted origin.
+
     // https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/runtime/MessageSender
     //   Firefox API does not set `sender.origin`
     if ( sender.origin !== undefined && sender.origin !== UBOL_ORIGIN ) { return; }
@@ -284,7 +310,7 @@ async function start() {
     // We need to update the regex rules only when ruleset version changes.
     const currentVersion = getCurrentVersion();
     if ( currentVersion !== rulesetConfig.version ) {
-        console.log(`Version change: ${rulesetConfig.version} => ${currentVersion}`);
+        ubolLog(`Version change: ${rulesetConfig.version} => ${currentVersion}`);
         updateDynamicRules().then(( ) => {
             rulesetConfig.version = currentVersion;
             saveRulesetConfig();
@@ -300,10 +326,10 @@ async function start() {
     registerInjectables();
 
     const enabledRulesets = await dnr.getEnabledRulesets();
-    console.log(`Enabled rulesets: ${enabledRulesets}`);
+    ubolLog(`Enabled rulesets: ${enabledRulesets}`);
 
     dnr.getAvailableStaticRuleCount().then(count => {
-        console.log(`Available static rule count: ${count}`);
+        ubolLog(`Available static rule count: ${count}`);
     });
 
     // https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/declarativeNetRequest
diff --git a/platform/mv3/extension/js/ruleset-manager.js b/platform/mv3/extension/js/ruleset-manager.js
index e1d9cdca4..0888eee2a 100644
--- a/platform/mv3/extension/js/ruleset-manager.js
+++ b/platform/mv3/extension/js/ruleset-manager.js
@@ -27,6 +27,7 @@
 
 import { browser, dnr, i18n } from './ext.js';
 import { fetchJSON } from './fetch.js';
+import { ubolLog } from './utils.js';
 
 /******************************************************************************/
 
@@ -72,8 +73,8 @@ function getDynamicRules() {
         const map = new Map(
             rules.map(rule => [ rule.id, rule ])
         );
-        console.info(`Dynamic rule count: ${map.size}`);
-        console.info(`Available dynamic rule count: ${dnr.MAX_NUMBER_OF_DYNAMIC_AND_SESSION_RULES - map.size}`);
+        ubolLog(`Dynamic rule count: ${map.size}`);
+        ubolLog(`Available dynamic rule count: ${dnr.MAX_NUMBER_OF_DYNAMIC_AND_SESSION_RULES - map.size}`);
         return map;
     });
     return dynamicRuleMapPromise;
@@ -142,7 +143,7 @@ async function updateRegexRules() {
         }
     }
     if ( rejectedRegexRules.length !== 0 ) {
-        console.info(
+        ubolLog(
             'Rejected regexes:',
             rejectedRegexRules.map(rule => rule.condition.regexFilter)
         );
@@ -178,10 +179,10 @@ async function updateRegexRules() {
     if ( addRules.length === 0 && removeRuleIds.length === 0 ) { return; }
 
     if ( removeRuleIds.length !== 0 ) {
-        console.info(`Remove ${removeRuleIds.length} DNR regex rules`);
+        ubolLog(`Remove ${removeRuleIds.length} DNR regex rules`);
     }
     if ( addRules.length !== 0 ) {
-        console.info(`Add ${addRules.length} DNR regex rules`);
+        ubolLog(`Add ${addRules.length} DNR regex rules`);
     }
 
     return dnr.updateDynamicRules({ addRules, removeRuleIds });
@@ -250,10 +251,10 @@ async function updateRemoveparamRules() {
     if ( addRules.length === 0 && removeRuleIds.length === 0 ) { return; }
 
     if ( removeRuleIds.length !== 0 ) {
-        console.info(`Remove ${removeRuleIds.length} DNR removeparam rules`);
+        ubolLog(`Remove ${removeRuleIds.length} DNR removeparam rules`);
     }
     if ( addRules.length !== 0 ) {
-        console.info(`Add ${addRules.length} DNR removeparam rules`);
+        ubolLog(`Add ${addRules.length} DNR removeparam rules`);
     }
 
     return dnr.updateDynamicRules({ addRules, removeRuleIds });
@@ -322,10 +323,10 @@ async function updateRedirectRules() {
     if ( addRules.length === 0 && removeRuleIds.length === 0 ) { return; }
 
     if ( removeRuleIds.length !== 0 ) {
-        console.info(`Remove ${removeRuleIds.length} DNR redirect rules`);
+        ubolLog(`Remove ${removeRuleIds.length} DNR redirect rules`);
     }
     if ( addRules.length !== 0 ) {
-        console.info(`Add ${addRules.length} DNR redirect rules`);
+        ubolLog(`Add ${addRules.length} DNR redirect rules`);
     }
 
     return dnr.updateDynamicRules({ addRules, removeRuleIds });
@@ -394,10 +395,10 @@ async function updateCspRules() {
     if ( addRules.length === 0 && removeRuleIds.length === 0 ) { return; }
 
     if ( removeRuleIds.length !== 0 ) {
-        console.info(`Remove ${removeRuleIds.length} DNR csp rules`);
+        ubolLog(`Remove ${removeRuleIds.length} DNR csp rules`);
     }
     if ( addRules.length !== 0 ) {
-        console.info(`Add ${addRules.length} DNR csp rules`);
+        ubolLog(`Add ${addRules.length} DNR csp rules`);
     }
 
     return dnr.updateDynamicRules({ addRules, removeRuleIds });
@@ -482,10 +483,10 @@ async function enableRulesets(ids) {
     const disableRulesetIds = Array.from(disableRulesetSet);
 
     if ( enableRulesetIds.length !== 0 ) {
-        console.info(`Enable rulesets: ${enableRulesetIds}`);
+        ubolLog(`Enable rulesets: ${enableRulesetIds}`);
     }
     if ( disableRulesetIds.length !== 0 ) {
-        console.info(`Disable ruleset: ${disableRulesetIds}`);
+        ubolLog(`Disable ruleset: ${disableRulesetIds}`);
     }
     await dnr.updateEnabledRulesets({ enableRulesetIds, disableRulesetIds });
     
diff --git a/platform/mv3/extension/js/scripting-manager.js b/platform/mv3/extension/js/scripting-manager.js
index f70758531..f60bb077c 100644
--- a/platform/mv3/extension/js/scripting-manager.js
+++ b/platform/mv3/extension/js/scripting-manager.js
@@ -472,21 +472,21 @@ async function registerInjectables(origins) {
     toRemove.push(...Array.from(before.keys()));
 
     if ( toRemove.length !== 0 ) {
-        console.info(`Unregistered ${toRemove} content (css/js)`);
+        ut.ubolLog(`Unregistered ${toRemove} content (css/js)`);
         promises.push(
             browser.scripting.unregisterContentScripts({ ids: toRemove })
                 .catch(reason => { console.info(reason); })
         );
     }
     if ( toAdd.length !== 0 ) {
-        console.info(`Registered ${toAdd.map(v => v.id)} content (css/js)`);
+        ut.ubolLog(`Registered ${toAdd.map(v => v.id)} content (css/js)`);
         promises.push(
             browser.scripting.registerContentScripts(toAdd)
                 .catch(reason => { console.info(reason); })
         );
     }
     if ( toUpdate.length !== 0 ) {
-        console.info(`Updated ${toUpdate.map(v => v.id)} content (css/js)`);
+        ut.ubolLog(`Updated ${toUpdate.map(v => v.id)} content (css/js)`);
         promises.push(
             browser.scripting.updateContentScripts(toUpdate)
                 .catch(reason => { console.info(reason); })
diff --git a/platform/mv3/extension/js/scripting/css-declarative.js b/platform/mv3/extension/js/scripting/css-declarative.js
index 71eca9b97..097d6fc7f 100644
--- a/platform/mv3/extension/js/scripting/css-declarative.js
+++ b/platform/mv3/extension/js/scripting/css-declarative.js
@@ -135,15 +135,13 @@ for ( const selector of selectors ) {
 
 if ( sheetText.length === 0 ) { return; }
 
-try {
-    const sheet = new CSSStyleSheet();
-    sheet.replace(`@layer{${sheetText.join('\n')}}`);
-    document.adoptedStyleSheets = [
-        ...document.adoptedStyleSheets,
-        sheet
-    ];
-} catch(ex) {
-}
+(function uBOL_injectCSS(css, count = 10) {
+    chrome.runtime.sendMessage({ what: 'insertCSS', css }).catch(( ) => {
+        count -= 1;
+        if ( count === 0 ) { return; }
+        uBOL_injectCSS(css, count - 1);
+    });
+})(sheetText.join('\n'));
 
 /******************************************************************************/
 
diff --git a/platform/mv3/extension/js/scripting/css-generic.js b/platform/mv3/extension/js/scripting/css-generic.js
index ad0169128..9da44f42b 100644
--- a/platform/mv3/extension/js/scripting/css-generic.js
+++ b/platform/mv3/extension/js/scripting/css-generic.js
@@ -60,7 +60,7 @@ const hashFromStr = (type, s) => {
     for ( let i = 0; i < len; i += step ) {
         hash = (hash << 5) + hash ^ s.charCodeAt(i);
     }
-    return hash & 0xFF_FFFF;
+    return hash & 0xFFFFFF;
 };
 
 /******************************************************************************/
@@ -162,7 +162,8 @@ const uBOL_processNodes = ( ) => {
     if ( styleSheetTimer !== undefined ) { return; }
     styleSheetTimer = self.requestAnimationFrame(( ) => {
         styleSheetTimer = undefined;
-        uBOL_injectStyleSheet();
+        uBOL_injectCSS(`${styleSheetSelectors.join(',')}{display:none!important;}`);
+        styleSheetSelectors.length = 0;
     });
 };
 
@@ -187,17 +188,12 @@ const uBOL_processChanges = mutations => {
 
 /******************************************************************************/
 
-const uBOL_injectStyleSheet = ( ) => {
-    try {
-        const sheet = new CSSStyleSheet();
-        sheet.replace(`@layer{${styleSheetSelectors.join(',')}{display:none!important;}}`);
-        document.adoptedStyleSheets = [
-            ...document.adoptedStyleSheets,
-            sheet
-        ];
-    } catch(ex) {
-    }
-    styleSheetSelectors.length = 0;
+const uBOL_injectCSS = (css, count = 10) => {
+    chrome.runtime.sendMessage({ what: 'insertCSS', css }).catch(( ) => {
+        count -= 1;
+        if ( count === 0 ) { return; }
+        uBOL_injectCSS(css, count - 1);
+    });
 };
 
 /******************************************************************************/
diff --git a/platform/mv3/extension/js/scripting/css-procedural.js b/platform/mv3/extension/js/scripting/css-procedural.js
index b52cc209b..388f1c822 100644
--- a/platform/mv3/extension/js/scripting/css-procedural.js
+++ b/platform/mv3/extension/js/scripting/css-procedural.js
@@ -103,16 +103,12 @@ if ( selectors.length === 0 ) { return; }
 
 /******************************************************************************/
 
-const addStylesheet = text => {
-    try {
-        const sheet = new CSSStyleSheet();
-        sheet.replace(`@layer{${text}}`);
-        document.adoptedStyleSheets = [
-            ...document.adoptedStyleSheets,
-            sheet
-        ];
-    } catch(ex) {
-    }
+const uBOL_injectCSS = (css, count = 10) => {
+    chrome.runtime.sendMessage({ what: 'insertCSS', css }).catch(( ) => {
+        count -= 1;
+        if ( count === 0 ) { return; }
+        uBOL_injectCSS(css, count - 1);
+    });
 };
 
 const nonVisualElements = {
@@ -641,9 +637,7 @@ class ProceduralFilterer {
         if ( styleToken !== undefined ) { return styleToken; }
         styleToken = this.randomToken();
         this.styleTokenMap.set(style, styleToken);
-        addStylesheet(
-            `[${this.masterToken}][${styleToken}]\n{${style}}\n`,
-        );
+        uBOL_injectCSS(`[${this.masterToken}][${styleToken}]\n{${style}}\n`);
         return styleToken;
     }
 
diff --git a/platform/mv3/extension/js/scripting/css-specific.js b/platform/mv3/extension/js/scripting/css-specific.js
index 0997385fb..40ad6dbb5 100644
--- a/platform/mv3/extension/js/scripting/css-specific.js
+++ b/platform/mv3/extension/js/scripting/css-specific.js
@@ -103,15 +103,13 @@ if ( selectors.length === 0 ) { return; }
 
 /******************************************************************************/
 
-try {
-    const sheet = new CSSStyleSheet();
-    sheet.replace(`@layer{${selectors.join(',')}{display:none!important;}}`);
-    document.adoptedStyleSheets = [
-        ...document.adoptedStyleSheets,
-        sheet
-    ];
-} catch(ex) {
-}
+(function uBOL_injectCSS(css, count = 10) {
+    chrome.runtime.sendMessage({ what: 'insertCSS', css }).catch(( ) => {
+        count -= 1;
+        if ( count === 0 ) { return; }
+        uBOL_injectCSS(css, count - 1);
+    });
+})(`${selectors.join(',')}{display:none!important;}`);
 
 /******************************************************************************/
 
diff --git a/platform/mv3/extension/js/utils.js b/platform/mv3/extension/js/utils.js
index bf3fdcf87..b02341f84 100644
--- a/platform/mv3/extension/js/utils.js
+++ b/platform/mv3/extension/js/utils.js
@@ -25,6 +25,10 @@
 
 /******************************************************************************/
 
+import { browser } from './ext.js';
+
+/******************************************************************************/
+
 function parsedURLromOrigin(origin) {
     try {
         return new URL(origin);
@@ -119,6 +123,14 @@ const hostnamesFromMatches = origins => {
 
 /******************************************************************************/
 
+const ubolLog = (...args) => {
+    // Do not pollute dev console in stable release.
+    if ( browser.runtime.id === 'ddkjiahejlhfcafbddmgiahcphecmpfh' ) { return; }
+    console.info(...args);
+};
+
+/******************************************************************************/
+
 export {
     parsedURLromOrigin,
     toBroaderHostname,
@@ -128,4 +140,5 @@ export {
     subtractHostnameIters,
     matchesFromHostnames,
     hostnamesFromMatches,
+    ubolLog,
 };
diff --git a/platform/mv3/make-rulesets.js b/platform/mv3/make-rulesets.js
index 83c0fe294..3b4c4fad9 100644
--- a/platform/mv3/make-rulesets.js
+++ b/platform/mv3/make-rulesets.js
@@ -358,7 +358,6 @@ async function processNetworkFilters(assetDetails, network) {
 // Load all available scriptlets into a key-val map, where the key is the
 // scriptlet token, and val is the whole content of the file.
 
-const scriptletDealiasingMap = new Map(); 
 let scriptletsMapPromise;
 
 function loadAllSourceScriptlets() {
@@ -367,28 +366,20 @@ function loadAllSourceScriptlets() {
     }
 
     scriptletsMapPromise = fs.readdir('./scriptlets').then(files => {
-        const reScriptletNameOrAlias = /^\/\/\/\s+(?:name|alias)\s+(\S+)/gm;
+        const readTemplateFile = file =>
+            fs.readFile(`./scriptlets/${file}`, { encoding: 'utf8' })
+              .then(text => ({ file, text }));
         const readPromises = [];
         for ( const file of files ) {
-            readPromises.push(
-                fs.readFile(`./scriptlets/${file}`, { encoding: 'utf8' })
-            );
+            readPromises.push(readTemplateFile(file));
         }
         return Promise.all(readPromises).then(results => {
             const originalScriptletMap = new Map();
-            for ( const text of results ) {
-                const aliasSet = new Set();
-                for (;;) {
-                    const match = reScriptletNameOrAlias.exec(text);
-                    if ( match === null ) { break; }
-                    aliasSet.add(match[1]);
-                }
-                if ( aliasSet.size === 0 ) { continue; }
-                const aliases = Array.from(aliasSet);
-                originalScriptletMap.set(aliases[0], text);
-                for ( let i = 0; i < aliases.length; i++ ) {
-                    scriptletDealiasingMap.set(aliases[i], aliases[0]);
-                }
+            for ( const details of results ) {
+                originalScriptletMap.set(
+                    details.file.replace('.template.js', ''),
+                    details.text
+                );
             }
             return originalScriptletMap;
         });
@@ -490,7 +481,7 @@ function groupHostnamesBySelectors(arrayin) {
     const out = Array.from(contentMap).map(a => [
         a[0], {
             a: a[1].a,
-            y: a[1].y ? Array.from(a[1].y).sort(hnSort) : undefined,
+            y: a[1].y ? Array.from(a[1].y).sort(hnSort) : '*',
             n: a[1].n ? Array.from(a[1].n) : undefined,
         }
     ]).sort((a, b) => {
@@ -564,7 +555,6 @@ async function processCosmeticFilters(assetDetails, mapin) {
     // The cosmetic filters will be injected programmatically as content
     // script and the decisions to activate the cosmetic filters will be
     // done at injection time according to the document's hostname.
-    const originalScriptletMap = await loadAllSourceScriptlets();
     const generatedFiles = [];
 
     const argsMap = domainBasedEntries.map(entry => [
@@ -602,6 +592,7 @@ async function processCosmeticFilters(assetDetails, mapin) {
         argsList[i] = details.a;
     }
 
+    const originalScriptletMap = await loadAllSourceScriptlets();
     const patchedScriptlet = originalScriptletMap.get('css-specific')
         .replace(
             '$rulesetId$',
diff --git a/platform/mv3/make-scriptlets.js b/platform/mv3/make-scriptlets.js
index 3955e324b..53a4435c6 100644
--- a/platform/mv3/make-scriptlets.js
+++ b/platform/mv3/make-scriptlets.js
@@ -164,7 +164,7 @@ export function compile(details, isTrusted) {
 
 export async function commit(rulesetId, path, writeFn) {
     const scriptletTemplate = await fs.readFile(
-        './scriptlet.template.js',
+        './scriptlets/scriptlet.template.js',
         { encoding: 'utf8' }
     );
     const patchHnMap = hnmap => {
diff --git a/platform/mv3/scriptlets/css-declarative.js b/platform/mv3/scriptlets/css-declarative.template.js
similarity index 94%
rename from platform/mv3/scriptlets/css-declarative.js
rename to platform/mv3/scriptlets/css-declarative.template.js
index 38eaad495..13415326a 100644
--- a/platform/mv3/scriptlets/css-declarative.js
+++ b/platform/mv3/scriptlets/css-declarative.template.js
@@ -27,10 +27,6 @@
 
 /******************************************************************************/
 
-/// name css-declarative
-
-/******************************************************************************/
-
 // Important!
 // Isolate from global scope
 (function uBOL_cssDeclarativeImport() {
diff --git a/platform/mv3/scriptlets/css-generic.js b/platform/mv3/scriptlets/css-generic.template.js
similarity index 94%
rename from platform/mv3/scriptlets/css-generic.js
rename to platform/mv3/scriptlets/css-generic.template.js
index 02010c5d6..4e9d93094 100644
--- a/platform/mv3/scriptlets/css-generic.js
+++ b/platform/mv3/scriptlets/css-generic.template.js
@@ -25,10 +25,6 @@
 
 /******************************************************************************/
 
-/// name css-generic
-
-/******************************************************************************/
-
 // Important!
 // Isolate from global scope
 (function uBOL_cssGenericImport() {
diff --git a/platform/mv3/scriptlets/css-procedural.js b/platform/mv3/scriptlets/css-procedural.template.js
similarity index 94%
rename from platform/mv3/scriptlets/css-procedural.js
rename to platform/mv3/scriptlets/css-procedural.template.js
index 81df35c2c..191d363b3 100644
--- a/platform/mv3/scriptlets/css-procedural.js
+++ b/platform/mv3/scriptlets/css-procedural.template.js
@@ -27,10 +27,6 @@
 
 /******************************************************************************/
 
-/// name css-procedural
-
-/******************************************************************************/
-
 // Important!
 // Isolate from global scope
 (function uBOL_cssProceduralImport() {
diff --git a/platform/mv3/scriptlets/css-specific.entity.js b/platform/mv3/scriptlets/css-specific.entity.js
deleted file mode 100644
index e6f494f66..000000000
--- a/platform/mv3/scriptlets/css-specific.entity.js
+++ /dev/null
@@ -1,51 +0,0 @@
-/*******************************************************************************
-
-    uBlock Origin - a browser extension to block requests.
-    Copyright (C) 2019-present 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
-*/
-
-/* jshint esversion:11 */
-
-'use strict';
-
-/******************************************************************************/
-
-/// name css-specific.entity
-
-/******************************************************************************/
-
-// Important!
-// Isolate from global scope
-(function uBOL_cssSpecificEntityImport() {
-
-/******************************************************************************/
-
-// $rulesetId$
-
-const argsList = self.$argsList$;
-
-const entitiesMap = new Map(self.$entitiesMap$);
-
-self.specificEntityImports = self.specificEntityImports || [];
-self.specificEntityImports.push({ argsList, entitiesMap });
-
-/******************************************************************************/
-
-})();
-
-/******************************************************************************/
diff --git a/platform/mv3/scriptlets/css-specific.js b/platform/mv3/scriptlets/css-specific.template.js
similarity index 94%
rename from platform/mv3/scriptlets/css-specific.js
rename to platform/mv3/scriptlets/css-specific.template.js
index ffc871b77..81c318d06 100644
--- a/platform/mv3/scriptlets/css-specific.js
+++ b/platform/mv3/scriptlets/css-specific.template.js
@@ -27,10 +27,6 @@
 
 /******************************************************************************/
 
-/// name css-specific
-
-/******************************************************************************/
-
 // Important!
 // Isolate from global scope
 (function uBOL_cssSpecificImports() {
diff --git a/platform/mv3/scriptlet.template.js b/platform/mv3/scriptlets/scriptlet.template.js
similarity index 100%
rename from platform/mv3/scriptlet.template.js
rename to platform/mv3/scriptlets/scriptlet.template.js