Hi eatc7402, There is a new feature for add ons in this version called add on signing. https://blog.mozilla.org/addons/2015/.../de-coupling-reviews-from-signing-unlisted-add-ons/ These are the plans for the next version that developers are currently preparing for: https://blog.mozilla.org/addons/2015/.../compatibility-for-firefox-44/ It is possible to download the add on signed version from the addons site: https://addons.mozilla.org/en-US/firefox/

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

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

• https://support.mozilla.org/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.org/kb/Unable+to+install+add-ons

If you see disabled or not compatible extensions in "Firefox menu button/Tools > Add-ons > Extensions" then click the Tools button at the left end of the Search bar to check if there is a compatibility update available.

If this didn't help then delete addons.json and possibly prefs.js in case there is a problem with preferences.

You can use this button to go to the current Firefox profile folder:

• Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
• http://kb.mozillazine.org/Profile_folder_-_Firefox

guigs said

These are the plans for the next version that developers are currently preparing for: https://blog.mozilla.org/addons/2015/.../compatibility-for-firefox-44/

https://wiki.mozilla.org/Firefox/AddOns/Status/Updates#Exec_Summary “Currently targeting Signing with no pref to turn off in Firefox 47”