uTube Force Flash

// ==UserScript==
// @name uTube Force Flash
// @namespace YT_flash_force
// @description Force Flash player embed. Note, that the code might be buggy, and might cause conflicts with Flashblock. Acknowledgements to Alexander Nartov for providing the code, and to Victor Desfe and JAOOTPYKHA for improvements to it. This userscript requires, that HTML5 playback is switched off in about:config (FF)
// @homepageURL https://github.com/juneyourtech/GM_YT/blob/master/uTube_force_Flash.user.js
// @version 0.2.2m
// @mod for Otter Browser
// @include *.youtube.com/watch*
// @grant GM_addStyle
// ==/UserScript==
// Notes:
//   * is a wildcard character
//   .tld is magic that matches all top-level domains (e.g. .com, .co.uk, .us, etc.)
/* ____80_character_separator________________________________________________ */

/* 28.07.2017: Code to enable Flash Player, with huge thanks to Alexander Nartov
   for the bulk of the code, and Victor Desfe for the showinfo/autoplay line.
   Additional credits: JAOOTPYKHA for fixing height/width issues.
   • Errata: Make sure you have HTML5 switched off for this to work. */

window.setTimeout(function() {
   var embedFrame = document.createElement("iframe");
   embedFrame.src = location.href.replace(/watch\?v=([^&]*).*/, "v/$1");
   embedFrame.src = embedFrame.src + ("?showinfo=0");
   embedFrame.style = "width: 100%; height: 100%;";
   var player = document.getElementById("player-api");

   // grab the current dimensions of the player
   var wid = player.clientWidth;
   var hei = player.clientHeight;

   player.innerHTML = "";

   // set the embedded player's dimensions to proper size
   embedFrame.style.height=hei+'px';
   embedFrame.style.width=wid+'px';

   player.appendChild(embedFrame);
   unsafeWindow.spf.dispose();
},
3000);
 //next to showinfo: &autoplay=1

//29.07.2017: disable static in player area (somewhat resource-intensive)
GM_addStyle("DIV.ytp-error CANVAS.ytp-tv-static {display:none;}");