FAIL: Certificate issue causing add-ons to be disabled or fail to install
and https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/
Worst of it is firefox does not provide a way for the user to continue to use the supposedly bad add-ons turning this bug from bad to worse. There is no technical reason which would prevent these add-ons from working.
Hotfix is deployed through about:studies but after allowing studies it did not yet show up for me. Official quote: ‘It may take up to six hours for the Study to be applied to Firefox.’ What a hotfix lol.
The general fix is in the next version 66.0.4 but having to wait to get basic functionality back sucks.
Update: Fortunately it took only about 30 minutes for the study to be added after I enabled studies.
I don’t like that Firefox installs studies without informing you that a new study was installed, or even better: for privacy conscious people ask if they want to participate on a per-study basis (I would enable studies if it would be opt-in).
It also provides close to no information about the studies in about:studies (mozilla often offer blog posts with detailed information about their studies, which could be linked in about:studies).