Firefox hangs with 100% CPU at (obviously) random times

Several times a day, my Firefox suddenly responds pretty slow and within seconds it no longer responds at all. The CPU usage of firefox.exe goes to 100% and the whole browser seems to be frozen. In some cases, the memory consumption in the TaskManager also increases slowly (about 8KB/s), but not always. However, after 30-60s the problem suddenly vanishes and everything is fine again.
An interesting detail: Firefox uses a lot of memory; I am not sure whether this is normal. Currently, I only have this tab opened, but it still uses 166MB! The peak memory usage even says 351MB, although I did not have more than 8 or 10 tabs open at the same time (no YouTube or similar memory intensive sites).
The problem might be caused by an update to an extension; at least I remember that there was an update shortly before the problem first appeared. However, I do not remember which extension it was. I have disabled almost every extension (only TabMixPlus, Download Statusbar, and TinyMenu are still active), and the problem is still there. It is hard to find the reason because the problem only happens three of four times a day and at random times, so it is hard to reproduce.
Some questions:
1) Anyone has got an idea what might cause these problems?
2) Is there a way to see which extensions have been updated recently?
3) Is there a way to see which extension uses how much of the CPU?
Thanks in advance!
gehho.
== This happened ==
A few times a week
== about two weeks ago (maybe after an add-on update, not sure which)

Just some additional info:
I just had the problem again, and it even occurred when I did not have any tab open! I did not even use Firefox, but just wanted to start to use it, but it did not respond. There was _nothing_ open, and when I checked the TaskManager, the memory consumption was up to 300 MB, and the CPU was again at 100%. After the CPU was down to 0% again, the memory slowly decreased as well. First, to ~260, then to ~200, now to ~170 MB. Maybe it will decrease even further...

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Please refer to the following thread for background information: http://forums.adobe.com/thread/734972?tstart=0
I'm re-listing this issue, as it has rasied its ugly head again, and I've no resolution this time.
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I can't understand why I'm now having this problem. Truth be told, I never really understood why recreating my domain profile in the first place resolved the problem last time.
However, I have now discovered something else...
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It seems this has been resolved!
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Probably he is using the default path given in the root folder and RoboHelp changes a temporary css file in that folder very frequently, in fact with every topic close.
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2 Feb 2013
Concerns: Firefox 18.0.1 often freezes, at random times, since about 31 Jan 2013
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