Backed out changeset 940739d0aaac (bug 1839439) for causing bc failures ast browser_audioScrubber.js on a CLOSED TREE

toolkit/themes/shared/pictureinpicture/player.css

@@ -635,8 +635,7 @@ input:checked + .slider::before {
 }
 
 @media (height <= 325px), (width <= 475px) {
-  #closed-caption,
-  #audio-scrubber {
+  #closed-caption {
     display: none;
   }