Later Mozilla team released official updates for the latest Firefox version 66 to fix disabled add-ons issue. All Existing Add-ons got Disabled, Can’t Install New Extensions When this issue occurred, we immediately shared workarounds and solutions to fix this issue and re-enable disabled add-ons and forcefully install new add-ons in Firefox in following tutorial: Since the certificate expired, it prevented all existing add-ons from running in browser and new add-ons from being installed in browser. This issue occurred due to an expired security certificate which is used by Firefox to check and verify add-ons. The add-on downloaded from this site could not be installed because it appears to be corrupt.

The add-on could not be downloaded because of a connection failure.

The add-on could not be verified for use in Firefox and has been disabled.

One or more installed add-ons cannot to be verified and have been disabled.

Nightly), all Firefox versions were having this irritating problem.įirefox users were getting lots of error messages while enabling or installing add-ons/extensions. It doesn’t matter what Firefox version are you using, whether it’s an old version of Firefox, latest version of Firefox or a testing version of Firefox (e.g. Also users were not able to install new extensions in their browser.

extensions, themes, dictionaries, language packs) in their Firefox browser got disabled automatically and they were unable to enable them again.

Suddenly all existing/installed add-ons (e.g.

Since May 03, 2019, Several Mozilla Firefox users are facing a very annoying and weird problem. SUMMARY: If you are using an older version of Mozilla Firefox web browser and all your installed add-ons/extensions got disabled and you are unable to install new extensions, this article will help you in fixing the issue.

Download older versions of firefox 52