Ghostery: Works with Firefox 3.5 - 11.0a1: https://addons.mozilla.org/en-US/firefox/addon/ghostery/ 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) and compatibility.ini in the Firefox profile folder to reset the extensions registry. *https://support.mozilla.com/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.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. See also: *http://kb.mozillazine.org/Preferences_not_saved *https://support.mozilla.com/kb/Preferences+are+not+saved

Hey cor-el, tyvm. Solution of deleting the extension.-- files does not work. The link to Ghostery worked partially. I can now get it but as with all of the add-ons that I am able to "enable" I have to do this manually after every reboot. Again, thank you Iugula