Firefox 66.03 add on break fix.

You can also turn on the "allow studies" feature under privacy. They are using that to distribute a fix. Can turn it back off once your add-ons reactivate.

Unfortunately on Android they haven't done anything yet. I got add-ons working again by changing xpinstall.signatures.required to false though.
 
Can someone explain this situation to a non-Firefox user. What's broken and was it deliberate breakage and if so why?
 
Here's the basics.

A Firefox release has been pushed — version 66.0.4 on Desktop and Android, and version 60.6.2 for ESR. This release repairs the certificate chain to re-enable web extensions, themes, search engines, and language packs that had been disabled (Bug 1549061). There are remaining issues that we are actively working to resolve, but we wanted to get this fix out before Monday to lessen the impact of disabled add-ons before the start of the week. More information about the remaining issues can be found by clicking on the links to the release notes above. (May 5, 16:25 EDT)
 
Android is updated too now.

Must have been a super fun weekend for Mozilla developers.
 
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