enable youtube-html5-player save-video-as option

[Marko Kaznovac]

{"name":"YouTube_HTML5","urlRegex":"^https?://www\\.youtube\\.com/watch\\?v=","urlExcludeRegex":"","enabled":true,"preserveDocWrite":true,"css":"","html":"","js":"(function() {\n var menu = document.getElementsByClassName(\"html5-context-menu\")[0];\n var saveas = menu.childNodes[1].childNodes[1];\t\n var video = document.getElementsByClassName(\"video-stream\")[0];\n saveas.setAttribute(\"href\", video.getAttribute(\"src\"));\n})();","filters":[]}

[in]sanity checks are not implemented,

please make sure you are using yt html5 player

https://www.youtube.com/html5