Firefox users last night attention to the problem that arose with browser extensions. The current plugins were inactive, and it was not possible to install new ones. The company said that the problem is related to the expiration of the certificate. It was also stated that a solution is already being worked on.
At the moment that the problem has been identified and a fix has been launched. In this case, everything will work automatically, users do not need to take any active steps in order for the extensions to work again. It has also been stated that one should not attempt to uninstall and reinstall extensions as this will remove all data associated with them.
So far, the fix is ββonly available for normal desktop versions of Firefox. A fix has not yet been generated for Firefox ESR and Firefox for Android. In addition, there may be issues with builds of Firefox installed from packages on Linux distributions.
There was also a problem for Tor Browser users. The NoScript add-on stopped working there. As a temporary solution in about:config set xpinstall.signatures.requiredentry = false.
To speed up the delivery of updates, it is recommended to go to Firefox Preferences -> Privacy & Security -> Allow Firefox to install and run studies and activate research support, then in about:studies check that hotfix-reset-xpi-verification-timestamp-1548973 is active . After applying the patch, research can be disabled.
Finally, a patch with an updated certificate can be installed manually from the XPI file. You can download it .