diff --git a/platform/chromium/manifest.json b/platform/chromium/manifest.json
index d1b66fa1b..5c8826760 100644
--- a/platform/chromium/manifest.json
+++ b/platform/chromium/manifest.json
@@ -2,7 +2,7 @@
     "manifest_version": 2,
 
     "name": "uBlock Origin",
-    "version": "1.14.12",
+    "version": "1.14.14",
 
     "commands": {
         "launch-element-zapper": {
diff --git a/src/js/cosmetic-filtering.js b/src/js/cosmetic-filtering.js
index 3e4d56070..6020466c6 100644
--- a/src/js/cosmetic-filtering.js
+++ b/src/js/cosmetic-filtering.js
@@ -51,6 +51,14 @@ var isValidCSSSelector = (function() {
     } else {
         matchesFn = div.querySelector.bind(div);
     }
+    // https://github.com/gorhill/uBlock/issues/3111
+    //   Workaround until https://bugzilla.mozilla.org/show_bug.cgi?id=1406817
+    //   is fixed.
+    try {
+        matchesFn(':scope');
+    } catch (ex) {
+        matchesFn = div.querySelector.bind(div);
+    }
     return function(s) {
         try {
             matchesFn(s + ', ' + s + ':not(#foo)');