I understand about Firefox's useage of memory and how it continues to grow ( thanks BC).

Every now and then the CPU useage goes through the roof.  Even when all of the tabs I've got open are on sites that don't do continuous updates.

I've got FF 3.6 b4 and I don't think it is a version or beta problem since I've I have read about this same problem on Mozilla's site with several previous versions.

I should add that I have done AV and spyware scans.

Any ideas?I'd try installing an earlier version to a different folder (you can always delete it later and just keep the new version) and see if you have the same problem. If you don't, you can narrow the problem down to the version. If you do, it's something else. Also, I assume you've tried other browsers (IE, Opera, whatever) and do NOT have this problem, correct?DLoad and install SpeedyFox.Allan

The problem happens after FF has been running for several days ( my machine is on 24/7).  I've got all the other browsers but never leave them running for that long, so no I haven't seen it in the other browsers.  When FF does start to max out CPU useage I reboot and everythings fine for a week or so.  I remember reading that you turn off your systems every night so you probably will never see the issue since you have a fresh reboot everyday.

Patio

Just DOWNLOADED Speedyfox so I'll see what happens.Okay, but same question. What happens with an earlier version of Firefox? And is there some reason you must use Firefox if that's the only browser causing the problem?In reading through the posts on Mozilla's Q & A site there were a number of posts with the same problems for several earlier versions like 3.0 something.

To me a browser is kind of a personal thing and for reasons I don't fully understand or can't put into words I just like FF.  Why do some people love broccoli and others hate it?

And I should reboot once a week anyway.Okay. As you point out, I do SHUT down daily - plus my primary browser is IE, so I've never encountered these problems. But if you're sure they are not unique to your system and you are comfortable putting up with them I guess that's fine And I absolutely AGREE about browsers. I have all of them installed but invariably always come back to IE - just what I'm comfortable with - so I understand your choice to stay with Firefox.It's because FireFox makes large usage of SQL and it is not HANDLED properly with regular memory/cache flushing....SpeedyFox addresses this...
When you see things getting sluggish you fire it up and it takes all of 6 seconds.It may be also some faulty add-on(s).
We're aware that FF is pretty RAM hungry, but it shouldn't be eating CPU cycles.

Close Firefox. Go Start>All Programs>Mozilla Firefox, click on Mozilla Firefox (safe mode). Same thing?Broni, just to let you know I took your advice and have been running FF in safe mode for a couple of days now with no problems.  But sometimes it would run a week in regular mode before it would act up.  I'll let you know.I'll be around