Firefox constantly hangs/freezes/stops etc. What's going on?

For the last 2-3 weeks, I've been experiencing massive issues with Firefox.
I use a desktop with Windows 7, 64-bit.
I originally started with Firefox 5, and then a week or so before the release of Firefox 6 I started experiencing these issues. I was ecstatic when I found the release of Firefox 6 two days early, and for maybe a day or so, it was perfect before the problems started again.
Problems include: Firefox constantly hangs, freezes, not responding, stops loading etc. Whatever you want to call it, it does it randomly for any reason. It's not set off by trying to access a particular website or whatever, it could just be trying to open in a new tab or window. It even happens with simple things like typing or scrolling down a page. When it freezes it freezes my entire system until it gets going again. Sometimes it will even freeze when the window is minimized and I'm not currently using Firefox for anything.
I've tried scanning for viruses, clearing settings and stored files, uninstalling and re-installing, disabling any and all add-ons, even down grading all the way back to 3.6 and still nothing works. I've also tried all the "trouble-shooting solutions" I've come across, and most of them involve add-ons I've never even heard of, let alone use, so these are useless to me.
I had issues with a non-responsive script at start up, but after disabling a Java add-on this stopped, however the constant freezing remains.
Like I said, it's been happening for a few weeks, no matter what version of Firefox I use.
I know I'm the millionth person to complain about this; I've read all the other threads, but nothing is being done about this issue.
I've used Firefox for 8 years, but this problem is so infuriating I'm ready to call it quits and move to a different browser, which I don't want to do because I hate all the rest.
Is there anything else I can do to solve this, or are we just going to have to wait for the developers to 'maybe' get around to fixing it?

Thanks for the reply!
I have noticed the high memory usage. And when I was having these issues I tried to install 3.6.18 and it wouldn't run.
But I had problems with my computer and sent it away for repair and now I'm running 6.0.2 with none of the previous problems I experienced.

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Firefox constantly hangs/freezes/stops etc. What's going on?

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