Fixes firefox issues

Author: Mihonarium

src/headless-hook.js

@@ -2,7 +2,16 @@
     const origPlay = HTMLMediaElement.prototype.play;
     HTMLMediaElement.prototype.play = function(...args){
         if(!this.isConnected){
+            let parent = this.parentNode;
+            let next = this.nextSibling;
             try{ (document.body || document.documentElement).appendChild(this); }catch(e){}
+            const res = origPlay.apply(this, args);
+            try{
+                if(parent){
+                    parent.insertBefore(this, next);
+                }
+            }catch(e){}
+            return res;
         }
         return origPlay.apply(this, args);
     };