I cannot access the add-on feature on the tools option - when I click on it, nothing happens
Also, I cannot download new apps, when I click on the "download" button, nothing happens.
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Delete the files extensions.* (extensions.sqlite, extensions.rdf, extensions.cache, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry. New files will be created when required.
See "Corrupt extension files": http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
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 to do a compatibility check.
You can also try to reset the preferences:
After not achieving success in the "Run" section, I tried starting FF with add-ons disabled and that solved my problem! While in that mode I removed many add-ons that were not compatible with FF 4 - then restarted FF - all is now working properly as far as I can see. Will come back if I find anything else.
Aaaaargh - now the icons keep shifting around and worse, disappearing from everywhere including the "customize" option. What NOW????
See:
Create a new profile as a test to check if your current profile is causing the problems.
See:
There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files) See:
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