Firefox will not load after an auto update

I am running Windows 8.1, 64-bit operating system. I think that FireFox automatically updated today and now I cannot start FireFox. I get a box that states add-ons are being checked for compatibility. The 32-bit designation is shown and it just spins and spins and will not go beyond that screen. I've tried everything I can think of to start FireFox but nothing seems to work. Help I'm having to use IE and I hate it.

Create a new profile as a test to check if your current profile is causing the problems.
Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.
Download a fresh Firefox copy and save the file to the desktop.
* Firefox 29.0: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you lose personal data like bookmarks and passwords from profiles of other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
* (32 bit Windows) "C:\Program Files\Mozilla Firefox\"
* (64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"
It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
* http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.
If you keep having problems then also create a new profile.
* http://kb.mozillazine.org/Profile_folder_-_Firefox
* http://kb.mozillazine.org/Profile_backup
* http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall
Do a malware check with some malware scanning programs on the Windows computer. Please scan with all programs because each program detects different malware.
Make sure that you update each program to get the latest version of their databases before doing a scan.
* Malwarebytes' Anti-Malware:
* http://www.malwarebytes.org/mbam.php
* SuperAntispyware:
* http://www.superantispyware.com/
* Microsoft Safety Scanner:
* http://www.microsoft.com/security/scanner/en-us/default.aspx
* Windows Defender: Home Page:
* http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
* Spybot Search & Destroy:
* http://www.safer-networking.org/en/index.html
* AdwCleaner:
* http://www.bleepingcomputer.com/download/adwcleaner/
* http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
* Kasperky Free Security Scan:
* http://www.kaspersky.com/security-scan
You can also do a check for a rootkit infection with TDSSKiller.
Anti-rootkit utility TDSSKiller:
* http://support.kaspersky.com/5350?el=88446
See also:
"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked
It is possible that your security software (firewall, anti-virus) blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
* https://support.mozilla.org/kb/Server+not+found
* https://support.mozilla.org/kb/Firewalls
* https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating
Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test to see if that helps.

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