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Every time I launch Firefox and go visiting some websites, I notice it freezes for about 10 seconds. Not always in the same websites, but it always happens sometime in the first 2 or 3 minutes of running. I can see the hard disk led is ON all the time the browser is hung.

My operating system is Linux and I don't currently have any extension/plugin installed here.

I have no form completion, no history and have no more than 20-30 bookmarks.

Has somebody noticed something similar, or know how can I debug this to find out what Firefox is doing or trying to do?

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Disable the Flash plugin if it's there and see if it continues. – Randolph West Sep 7 '11 at 21:50
No flash/other plugins installed – user683887 Sep 7 '11 at 21:52
possibly related: superuser.com/q/82492/494 – sblair Sep 7 '11 at 21:56
I tried deleting my mozilla directory but the problem remains. I've updated the question to state I set firefox not to save form data nor browsing history, so I think databases should not a problem here? – user683887 Sep 7 '11 at 22:06
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It's probably loading/compiling some problematic add-on (double check because you can't normally have none) or is trying to read a large sqlite file/journal. In either case, try using a new profile. Under Linux, the profile directory is under ~/.mozilla. – billc.cn Sep 7 '11 at 23:05
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Make sure you have the relevant debug packages if any. Try running strace firefox and also running it in gdb and producing a backtrace after the freezing stops (you can google for info on how to produce a backtrace with gdb). Both will likely slow down firefox but will give quite a bit of useful info. You can post them on pastebin and link here, but it might also be prudent to submit a bug report to mozilla or your distro.

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