I couldn't manage to find anything on how to use Jquery to append &html5=1 to the video results on search/feed/subscriptions and such to all video URL's.
The following are links that MAY contribute to a solution:
Example 1: http://jsfiddle.net/WFd79/
Example 2: YouTube video in HTML not working
Example 3:
function main(){
//Standard Logo
document.getElementById('.yt-lockup.yt-lockup-tile a.ux-thumb-wrap').setAttribute('href', 'http://www.youtube.com/feed/subscriptions');
}
main();
Note: If commas can be used to append to multiple ID's or classes such as titles plus thumbnails, would be more user friendly. This is also not needing a solution for embeds or iframes.
Note 2: I use tampermonkey extension to inject jquery.
P.S. I thank anyone who attemps to find a solution or has one so others may benefit from this as well.