Hi, it looks like Firefox just had a major issue with an expired certificate,
causing it to automatically disable all add-ons and preventing the installation
of new ones.

https://discourse.mozilla.org/t/certificate-issue-causing-add-ons-to-be-disabled-or-fail-to-install/39047
(Site currently under heavy traffic or something, doesn't always load.)

> Certificate issue causing add-ons to be disabled or fail to install:
>
> 12:50 p.m. UTC / 03:50 a.m. PDT: We rolled-out a fix for release, 
> beta and nightly users on Desktop. The fix will be automatically 
> applied in the background within the next few hours, you don���t need
> to take active steps.
>
> In order to be able to provide this fix on short notice, we are using
> the Studies system. You can check if you have studies enabled by going
> to Firefox Preferences -> Privacy & Security -> Allow Firefox to install
> and run studies.
> 
> You can disable studies again after your add-ons have been re-enabled.
> 
> We are working on a general fix that doesn���t need to rely on this
> and will keep you updated.

Would it be possible to push out an urgent update to the Tumbleweed Updates
repo? Or any other temporary workaround recommended for openSUSE users?