LOL, first time when I saw FF 3 I thought what is it did google found Final Fantasy 3. Then thought why is iMav playing such old game

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Then little thinking got it is our dear FireFox 3, heehe. Mate I also do not know exact reason. It happens to me on lappy most of the time I try using FF even with 2GB RAM.
Exactly same FF going up to 100-200 MB and taking alot CPU usage.
Same happens to my Opera, but then its due to System maintenance started by TuneUp Utilities, and I have to close the maintenance job
I can give my point of view that it may be happening due to some other application taking up res FF is accessing, hence causing locking resulting FF getting desparate to work well increasing the RAM and CPU usage, finally.