From https://discourse.mozilla.org/t/certificate-issue-causing-add-ons-to-be-disa... :
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.
This is a lie. I had both updates and studies disabled but "hotfix-update-xpi-intermediate" appeared in my addons anyway. It also failed to re-enable noscript. Regards, Bill Herrin -- William Herrin ................ herrin@dirtside.com bill@herrin.us Dirtside Systems ......... Web: <http://www.dirtside.com/>