Done, thanks.
Do you mind linking to the bug report?
Sure, it's here: https://bugzilla.mozilla.org/show_bug.cgi?id=860478
Thank you. I'll follow up there!
Are you in Firefox proper, or Nightly (just asking for a friend of a friend) ;)
The rendering engine is fairly important for apparent speed and smoothness (e.g. with scrolling). These are issues where Firefox was traditionally not rated highly.