add a version check to force user interaction to unmute for older Firefox only (lesser than 68)

modules/browser/BrowserCapabilities.js

@@ -107,7 +107,7 @@ export default class BrowserCapabilities extends BrowserDetection {
      * @returns {boolean}
      */
     isUserInteractionRequiredForUnmute() {
-        return this.isFirefox() || this.isSafari();
+        return (this.isFirefox() && this.isVersionLessThan('68')) || this.isSafari();
     }
 
     /**