Firefox after update is stuck in a loop of verifying addons and wiil not run.

Following an automatic update, Firefox will not open. When trying to open, the message, in the Firefox Update window appears "Checking your add-ons for compatibility with this version of Firefox" This may take a few minutes" a Timing bar appears and runs to completion and the "clock" just turns. So far I let it run for over an hour with no completion of the check. My OS is Windows 8. Up until a month ago Firefox worked well, but not now. I suspected a virus, but the total deep scan produced no results. I have a screenshot of the message for what it may be worth, but for some reason I cannot attach it here.
I want to solve this Firefox has been the best browser for me for quite sometime.
Thanks
edit: removed your mail address from public display, since the only thing it will attract are spam bots. you will be notified per mail once somebody replies to the thread. (philipp)

You can check for problems with preferences.
Delete a possible user.js file and numbered prefs-##.js files and rename (or delete) the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in the current Firefox release.
*http://kb.mozillazine.org/Preferences_not_saved
*http://kb.mozillazine.org/Resetting_preferences
It is possible that there is a problem with the file(s) that store the extensions registry.
Delete the extensions.* files (e.g. extensions.json, extensions.sqlite, extensions.ini) 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 or not compatible extensions in "Firefox/Tools > Add-ons > Extensions" then click the Tools button at the left end of the Search bar to check if there is a compatibility update available.
If this hasn't helped then also delete possible addons.json and addons.sqlite files.

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2. Please resolve your thread by marking the post "Solution?" which solved it for you!
3. Install free BlackBerry Protect today for backups of contacts and data.
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