With many open tabs (80+) Firefox regularly (every 10sec) hangs for a few seconds because of session storing where the CPU is at 100%. Btw that is the reason why videos in Firefox are hanging every 10sec, too. Why is this operation so demanding?

When I'm using Firefox for a long time and I'm working with several open windows and many open tabs (80+), Firefox hangs/freezes every 10sec for 1-3sec. This is very annoying. The reason for this seems to be the session store operation, which gets executed every 10sec. In my experience (or rather on my computer) this isn't noticeable when I'm just working with around 40 open tabs.
This also seems to be the reason for hanging videos in firefox (although youtube is quite robust; others are not) because they stop every 10sec, too. For this time (the 1-3sec) the taskmanager tells me that firefox is using all the available cpu power. I'm really wondering why the session store operation has such an influence on Firefox' behaviour.
My computer is a Core 2 Duo E6600 with 3GB RAM and a decent hdd.

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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