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

After I updated day to FF8.0 a few days ago, I noticed that the buttons next and previous has nothing... and then realized that opening a new URL in tab not even leave no trace of the previous URL.
Having had bad experiences with all the major upgrades of FF 4.0 from, I decided to reinstall 3.6.17 who had worked perfectly. Front/rear were very good then, BUT
(1) none of the my extensions add-on worked at all, even though it has been shown as active.
(2) when I tried to access the options for any extension, window add-on locks up completely.
(3) when I've updated and tried to install the extensions, the operation has failed with an error "203".

I tried to reinstall FF a couple of times without improving the things and then did a restore of Windows 7 to the State before the upgrade FF8.0. Still no joy!

I have checked my McAfee Security Center and can find no problem. What can I do to restore the functioning without loss of passwords, bookmarks or plugins? I can accept losing all current extensions as I can get them back once FF allows me to download and install them.

NOTE: All troubleshooting information about extensions and the printing preferences removed from the box below - too big!

It is possible that there is a problem with the files that store the registry extensions.

Delete the files extensions.* (e.g., extensions.sqlite, extensions.ini, extensions.cache and extensions.rdf) and compatibility.ini in the Firefox profile folder to reset the extensions registry.

New files will be created if necessary.

See "extension corrupted files:

If you see disabled extensions, is not compatible, in "tools > Modules > Extensions ' and then click the Tools button, on the left side of the search bar (or click on the"Find updates"button in older versions of Firefox) to do a check of compatibility or to see if there is an available update compatibility.

Tags: Firefox

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