Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.

You can try these free programs to scan for malware, which work with your existing antivirus software:

• Microsoft Safety Scanner
• MalwareBytes' Anti-Malware
• TDSSKiller - AntiRootkit Utility

Microsoft Security Essentials is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.

Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Did this fix your problems? Please report back to us!

I ran a scan with Microsoft Safety Scanner and MalwareBytes and removed the 4 infected files (nothing seemed major). Then restarted the computer and am still having the same problem. Thanks for the suggestion. When it loads it doesn't load all the buttons/address/search bars and then when I try to click on any of them it crashes. Here's a screenshot of a recent "load" right before a crash.

We're sorry to hear that Firefox is crashing. In order to assist you better, please follow the steps below to provide us crash ID's to help us learn more about your crash.

1. Enter about:crashes in the address bar (that's where you enter your website URL) and press Enter. You should now see a list of submitted crash reports.
2. Copy the 5 most recent crash ID's that you see in the crash report window 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.

As a test of how Firefox 21 runs "uncustomized" on your system, could you create a new Firefox profile? In addition to bypassing current add-ons and custom settings, it should have completely fresh settings databases and a fresh cache folder.

Close Firefox and start up in the Profile Manager using the search box on the Start menu:

firefox.exe -p

In the Profile Manager, click Create and accept the default folder location (to avoid data loss, do not link the new profile to any existing folder). To switch profiles after this test, you can close Firefox and return to this dialog.

Does Firefox's UI work correctly in the new profile? If not, then...

Certain Firefox problems can be solved by performing a Clean reinstall. This means you remove Firefox program files (but not your personal settings) and then reinstall Firefox. Please follow these steps:

Note: You might want to print these steps or view them in another browser.

1. Download the latest Desktop version of Firefox from http://www.mozilla.org/en-US/firefox/fx/#desktop and save the setup file to your computer.
2. After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu).
3. Delete the Firefox installation folder, which for 64-bit Windows 7 is located here by default:
   • C:\Program Files (x86)\Mozilla Firefox
4. Now, go ahead and reinstall Firefox:
   1. Double-click the downloaded installation file and go through the steps of the installation wizard.
   2. Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.

Does that cure it?

Hi cs150, I should note that removing the program folder may remove plugins dropped there by some installers, such as the Microsoft Windows Media Player Plugin for Firefox. You may want to back up this folder:

C:\Program Files (x86)\Mozilla Firefox\Plugins

Thanks for the suggestions everyone... I decided to uninstall and download Firefox fresh (rather than just update). Everything works fine now... Thanks.

1. Go to "Tools>Options"

2. In the "Advanced" Tab click on "General" tab

3. Untick "Use hardware acceleration when available"

Confirmed working!!!!

Regards, Santosh Tupsy