So, I have 13.10 installed, and Firefox has been slow lately. After opening preferences, whenever I click on another window then click back to Firefox, it takes 5-10 seconds for anything I do to register. This has been happening both with Firefox 26-28, by the way. (Sticking with the stable branches for now.) None of my add-ons are known to be particularly grievous offenders when it comes to performance. (about:memory categorizes the whole batch of add-ons as taking only 31 MB of memory out of the 1GB that Firefox sometimes requires.) I dual-boot and don't have this performance issue with Firefox in Windows. Is there a way I can diagnose the issue?
[update:] I seem to be able to replicate this issue happening anytime after I open the HUD in any application. Does anyone have a work around besides the obvious "Don't use HUD"?