After installing Firefox 12.0 now it freezes on "checking add-ons" and won't open

I got an update notice and installed Firefox 12.0. I installed and the program froze during "Checking Your Add-Ons" portion of the install. Now Firefox will not open. Keeps getting stuck on that same step of the install. Tried installing 4 different old versions of firefox and the exact same problem. I sit and wait up to 20 minutes and nothing happens, I just get an hour-glass for checking add-ons phase of install. I'm using windows 7.

It is possible that there is a problem with the file(s) that store the extensions registry.
Delete the files extensions.* (e.g. extensions.sqlite, extensions.ini, extensions.cache) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
*https://support.mozilla.org/kb/Profiles
New files will be created when required.
See "Corrupt extension files":
*http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
*https://support.mozilla.org/kb/Unable+to+install+add-ons
If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the Tools button at the left side of the Search Bar (or click the "Find Updates" button in older Firefox versions) to check if there is a compatibility update available.
Also check for problems with the prefs.js file and a possible user.js file.
*http://kb.mozillazine.org/Preferences_not_saved
*https://support.mozilla.org/kb/Preferences+are+not+saved
You can create a new profile as a test to check if your current profile is causing the problems.
See "Basic Troubleshooting: Make a new profile":
*https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile
If the new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.
See:
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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|___________________
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After installing Firefox 12.0 now it freezes on "checking add-ons" and won't open

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