Here is a link to this doc - useful for seeing whether requestAnimationFrame is getting called if you open this page in a new (background) tab.
|Browser||Regular page||Page opened in another tab|
|Chromium 19 (Win)||Runs at ~60fps; stops running when you switch to another tab; restarts when you switch back||Doesn't start running until you switch to that tab|
|Firefox 10 (Win/Lin)||Runs at ~60fps; goes very slow when you switch to another tab; restarts when you switch back||Runs very slowly, gradually getting slower, runs normally when you switch to the tab|
|Safari 5.1.2 (Win)||NO IMPLEMENTATION OF REQUESTANIMATIONFRAME|
|Opera 11.61 (Win)||NO IMPLEMENTATION OF REQUESTANIMATIONFRAME (not in Opera Next 12.0 either)|
|IE9 (Win)||NO IMPLEMENTATION OF REQUESTANIMATIONFRAME (in IE10 according to caniuse.com)|
The Firefox throttling back behaves as follows: