When I click on tools/add-ons, add-ons will not come up so it cannot be accessed.

I am trying to uninstall extensions that I think are causing problems with Firefox but I cannot get to add-ons. When I click on tools/add-0ns there is a brief flash and then nothing.

You can delete the files extensions.* (extensions.rdf, extensions.cache, extensions.ini, extensions.sqlite) and compatibility.ini in the Firefox [[Profiles|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 extensions that are not compatible on the next start in "Tools > Add-ons > Extensions" then click the "Find Updates" button to do a compatibility check.

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