[nothrabannosir]

I didn't read the entire bugreport; did anybody mention non-gif dynamic favicon changes? Like this:

https://gist.githack.com/hraban/e669edce68fbb9cd004b/raw/5f8...

(essentially: $('link[rel=icon]')[0].href='...';)

Because that's kind of useful for a lot of sites. Then again, if you don't remove that, what's the use of banning gifs?

[realusername]

That's interesting, the animation seems to be slower when I'm on another tab, maybe Firefox has some optimisations affecting this.

[TheCoreh]

It has. IIRC the setTimeout and serInterval functions are throttled to 1000ms while the tab is unfocused.