Hello motom, definitely you are use quite a lot of extensions ! and Extensions can cause Firefox to use more memory than it normally would., i think you must select only the needful ones.

for the crashes :

1. Enter about:crashes in the Firefox address bar and press Enter. A Submitted Crash Reports list will appear, similar to the one shown below.
2. Copy the 5 most recent Report IDs that start with bp- and paste them into your response here.

Thank you for your help!

More information and further troubleshooting steps can be found in the Troubleshoot Firefox crashes (closing or quitting unexpectedly) article.

Thanks ideato,

I know many add-ons will use more memory. I actually tried to start a new profile with less add-on, before I reinstalled windows, but the firefox still crash, so I thought it might be my windows' problem.

However it crashes again with my new window, so I think it might be something else.

Only have one with bp- with new windows bp-e038347e-eb2a-4cee-8f47-faf502131215

these are the from the old windows. bp-0be0e95a-713d-4398-8003-88de42131204 bp-5add0041-2cf7-42a9-9136-1fab82131204 bp-225a2eab-f91a-465b-88a1-e78a92131204 bp-9317d5b2-1653-484f-b198-dfa082131204 bp-ccbed3f2-22bc-4c23-a17e-438a62131205

please let me know when else you need :)

Thank you

Try to upgrade your graphics drivers to latest, also, turn off hardware acceleration, and disable hardware acceleration in your Flash Player settings. (See this article for more information on using the Flash plugin in Firefox).

To disable hardware acceleration in Flash Player:

1. Go to this Adobe Flash Player Help page.
2. Right-click on the Flash Player logo on that page.
3. Click on Settings in the context menu. The Adobe Flash Player Settings screen will open.
4. Click on the icon at the bottom-left of the Adobe Flash Player Settings window to open the Display panel.
   
   The image "fpSettings1.PNG" does not exist.
   
5. Remove the check mark from Enable hardware acceleration.
6. Click Close to close the Adobe Flash Player Settings Window.
7. Restart Firefox.

This Flash Player Help - Display Settings page has more information on Flash Player hardware acceleration, if you're interested.

thanks again

Thanks ideato

done the disable hardware acceleration, will update the graphic driver as well. and keep an eye for awhile and report back.

one more thing i forgot the mention, usually right before the crash, the firefox will start to run very strangely, like the bookmark bar and add on back, everything except the website will disappear for awhile.

Hello motom,

Since you're running so many add-ons have you tried disabling them to see if the problem persists? Try Firefox Safe Mode to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.

(If you're not using it, switch to the Default theme.)

• On Windows you can open Firefox 4.0+ in Safe Mode by holding the Shift key when you open the Firefox desktop or Start menu shortcut.
• On Mac you can open Firefox 4.0+ in Safe Mode by holding the option key while starting Firefox.
• On Linux you can open Firefox 4.0+ in Safe Mode by quitting Firefox and then going to your Terminal and running: firefox -safe-mode (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
• Or open the Help menu and click on the Restart with Add-ons Disabled... menu item while Firefox is running.

Once you get the pop-up, just select "'Start in Safe Mode"

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one. Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article for that.

To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.

Thank you. Patrick

I think problem is solved. Firefox is running ok now , using over 2GB ram on firefox without problem (64bit windows 7). It explained why I opened new profile without add-on and reinstalled windows, problem still occurred. It used to crash when using over 1GB ram (32bit windows7) too bad I used to only try to look for solution online instead of here.

thanks so much ideato. this problem has been bothering me for ages. :)

You are welcome