Weird Firefox performance issue

[Jonathan Kamens]

Hi everyone,

I was seeing really, really poor performance from Firefox. I'm not sure 
exactly when it started being a problem, but it was going on for at 
least a week and I certainly saw it with Firefox 12 (in F17 x86_64).

I thought I would try moving my profile out of the way to see if 
performance would improve, so I shut down Firefox and moved 
~/.mozilla/firefox/*.default somewhere else. But then when I tried to 
restart Firefox, it said that it was already running but not responding. 
Clearly moving the *.default directory isn't the way to go.

So I then put it back where it had been and instead moved all of 
~/.mozilla/firefox out of the way. After doing that, I was able to 
restart Firefox, and indeed performance was much better.

Having confirmed that, I deleted the newly created ~/.mozilla/firefox 
and moved the only one back into place so that I could try disabling 
extensions, etc. bit by bit to identify the culprit. But when I then 
restarted Firefox, the performance problems were gone!

In short, somehow moving either ~/.mozilla/firefox/*.default or 
~/.mozilla/firefox out of the way temporarily and then putting it back 
seems to have somehow cured the performance issue. I don't understand 
why that might be and think it's rather odd, and I'm not sure how I'd 
even begin to bugzilla it. Does anybody have any thoughts? Is anyone 
else seeing anything like this?

  jik

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