New Problem with Firefox?

when I run firefox, my cpu usage become 99%-90% (for this software). in past sometimes this problem occur (in the middle of using it) and I close and run it again but now when I run it, this problem occur. how can I fix it? (I read many articles about "How can fix FF memory leak" but in these articles we must run the program and follow the instructions, the problem is I can't use my program and it's address bar (Show "Not Responding")

Thanks everyone

Answers:
Yes, supposedly the memory leak problems still exist in Firefox 1.5.

There is also a new feature introduced with Firefox 1.5 that causes to to cache many pages in memory in the pessimistic assumption that you will going back and forth a lot between the pages. With multiple tabs open, this RAM-grabbing really adds up! So you can disable this feature if you want. Check the preferences. The feature is on by default.

There is a 3rd problem. Microsoft kind of broke the way that ActiveX controls that support user input events work in IE. This was due to them reaching an impasse (not winning, in other words) in their defense against a lawsuit by Eolas. They published a work-around for website developers who use Flash. The work around uses Javascript. From what I understand the work-around, which is being widely used, makes Macs display these pages really slowly.

I guess since this is kind of Flash's fault/problem - you might want to just disable .SWF files temporarily in Firefox and/or disable the Flash plugin in Firefox. Kind of a shame but if their software is running lame on the web, what can they expect people to do?

Maybe Microsoft will come out with a better workaround in the future. Until then, too bad for Flash.

For some reason, I have found Flash starting to get used more on US government public websites recently. Be prepared for them to not work quite all the way.

Flash is a proprietary, closed, constantly changing (as seen this year following MS-EOLAS situation) technology. One hopes all commercial and non-profit websites that do use some flash, no how to degrade to still function correctly when Flash is not available/running.

Firefox has a safeboot mode. See the Firefox site for details, using a different web browser.

If worse comes to worse, you can delete Firefox and its preferences, and reinstall it. On the Mac, to get rid of a program you delete it. On MS-Windows, that can be disastrous - run an uninstaller instead. Hopefully, you have a backup of all your bookmarks.