We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Firefox won't install any addons/themes, existing ones don't show up on addon list.

  • 1 reply
  • 28 have this problem
  • 14 views
  • Last reply by cor-el

AnonymousUser
AnonymousUser
more options

Okay so when I go to tools>add-ons the list is empty, it shows no extensions, themes, languages, plugins even though there are ones installed and in use. Also when I try to download add-ons they don't install and don't show up on the list either.

This happened

Every time Firefox opened

Okay so when I go to tools>add-ons the list is empty, it shows no extensions, themes, languages, plugins even though there are ones installed and in use. Also when I try to download add-ons they don't install and don't show up on the list either. == This happened == Every time Firefox opened

All Replies (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

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