Performance is qualitatively worse in recent builds of Firefox

[imbstack]

In Aurora and standard release Firefox, scrolling the mouse is rather jittery compared to Chrome. This could just be Chrome having a faster js engine, but perhaps there is something we can do to alleviate the slowness Firefox is feeling.

Just submitting this bug for a rainy day and to attach data to when found.

[fhats]

On this subject, I think the JS client as a whole could benefit from some profiling. I don't know that there's anything that really qualifies as low-hanging fruit on the client performance side of things, but it would be interesting to find out.