Firefox Constantly Freezing Entire PC When Flash Installed

I've had an ongoing, highly annoying problem for months now. I've used Firefox for years without issues, yet several months ago I noticed I would be browsing the web and Firefox would randomly freeze. I would then attempt to minimize the window, and nothing would happen. If I click on the Start Menu, nothing would happen. If I tried to open my task manager, nothing would happen. The freezes could last between 45 seconds to several minutes, and there seemed to be no particular type of website that caused the freeze - it's sporadic, best as I can tell.
Not long ago, I formatted my entire PC, upgraded the motherboard, processor, power supply, hard drive, and video card. I then installed Windows 8 (previously had been using 7). Same problem occurred.
I did some searching on the web and wound up disabling Firefox hardware acceleration, the freezing would still occur.
Next I uninstalled Firefox, and installed Opera. Same exact types of freezes. I installed Google Chrome, same exact types of freezes. I then uninstalled everything and started using Internet Explorer (barf), and much to my surprise all the freezing stopped.
About a month ago, I formatted my PC again, and this time I installed Opera without any version of Adobe Flash. No freezing.
My hard drive crashed earlier this week, prompting another complete reinstall of my OS, only this time I downgraded to Windows 7, installed Firefox, and the freezing immediately started up again. Uninstalled Firefox, installed Chrome, same problem.
I am completely and totally stumped as to what is going on that's causing this freezing, and I'd be greatly appreciative for any input I receive.
Thanks.

We are sorry to hear that you are experiencing a problem with Firefox.
You are using Windows 7. Correct?
'''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.
[[Image:FirefoxSafeMode|width=520]]
''Once you get the pop-up, just select "'Start in Safe Mode"''
[[Image:Safe Mode Fx 15 - Win]]
'''''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 [[Troubleshooting extensions and themes]] article for that.
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''
Please report back soon.

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