How to restore all extensions after FF8.0 prevented them all?

After I updated to FF8.0 a few days ago, I noticed that the Back and Forward buttons did nothing... and then realised that opening a new URL in the same tab failed to leave any trace of the previous URL.
Having had bad experiences with all the major FF upgrades from 4.0 onwards, I decided to reinstall 3.6.17 which had been working perfectly. Back/Forward were fine then, BUT
(1) none of my add-on extensions worked at all, even though they were shown as enabled.
(2) when I tried to access the options for any extension, the Add-on window locked up completely.
(3) when I updated and tried to install extensions, the operation failed with a "203 error".
I tried reinstalling FF a couple of times without improving things and then did a Windows 7 Restore to the state before the FF8.0 upgrade. Still no joy!
I have checked my McAfee Security Centre and can find no problem there. What can I do to restore the correct operation without losing passwords, bookmarks, or plugins? I can accept losing all the current extensions as I can get them back once FF allows me to download and install them.
NOTE: ALL troubleshooting Information about extensions and print-related preferences deleted from box below - too big!

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, extensions.rdf) and compatibility.ini in the [[Profiles|Firefox profile folder]] to reset the extensions registry.<br />
New files will be created when required.
See "Corrupt extension files":
* http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
* https://support.mozilla.com/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 do a compatibility check or see if there is a compatibility update available.

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