diff --git a/src/shared/compatibility.js b/src/shared/compatibility.js
index 01a2ba701..53b61cadb 100644
--- a/src/shared/compatibility.js
+++ b/src/shared/compatibility.js
@@ -101,14 +101,17 @@ const hasDOM = typeof window === 'object' && typeof document === 'object';
   if (div.classList.toggle('test', 0) === false) {
     return;
   }
-  const originalDOMTokenListToggle = DOMTokenList.prototype.toggle;
 
   DOMTokenList.prototype.toggle = function(token) {
     if (arguments.length > 1) {
       const force = !!arguments[1];
       return (this[force ? 'add' : 'remove'](token), force);
     }
-    return originalDOMTokenListToggle(token);
+
+    if (this.contains(token)) {
+      return (this.remove(token), false);
+    }
+    return (this.add(token), true);
   };
 })();
 
diff --git a/web/pdf_find_bar.js b/web/pdf_find_bar.js
index 665352797..d86993307 100644
--- a/web/pdf_find_bar.js
+++ b/web/pdf_find_bar.js
@@ -180,7 +180,7 @@ class PDFFindBar {
     }
     Promise.resolve(matchesCountMsg).then((msg) => {
       this.findResultsCount.textContent = msg;
-      this.findResultsCount.classList[!total ? 'add' : 'remove']('hidden');
+      this.findResultsCount.classList.toggle('hidden', !total);
       // Since `updateResultsCount` may be called from `PDFFindController`,
       // ensure that the width of the findbar is always updated correctly.
       this._adjustWidth();