WebRender Better

Finish review in ReviewBoard
The title bar in github
Opening the sidebar on http://html5test.com/
sticky user avatars on IRCCloud
scrolling in the devtools style editor on Mac

http://www.bbc.com/capital/story/20160914-the-man-behind-the-million-dollar-homepage
https://marmalead.com search results destroys regular Firefox
https://kangax.github.io/compat-table/esnext/
https://gsmarena.com
https://bholley.net/blog/latest/
https://www.outvote.io/ (scrolling jank)

Demo:
tab switch all the tabs vs. chrome shows well

Android:
https://www.notebookcheck.net/Computer-Games-on-Laptop-Graphics-Cards.13849.0.html from https://www.reddit.com/r/firefox/comments/e17w2a/animations_arent_smooth_on_firefox_for_android/


https://www.w3.org/TR/html5/single-page ?

https://codepen.io/ivorjetski/pen/xMJoYO (resizing is much better than Chrome)
https://codepen.io/ivorjetski/pen/xxGYWQG
https://codepen.io/ivorjetski/pen/dBYWWZ


Things webrender fixes, meta bug https://bugzilla.mozilla.org/show_bug.cgi?id=1464426