On 2019-05-03 8:37 p.m., PS56k wrote:
Mozilla has rolled-out a fix for this. 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, they are using
the Studies system. You can check if you have studies enabled
1. Go to [=] > Options > Privacy & Security.
2. Make sure "Allow Firefox to install and run studies" is check marked.
I you had it disabled, you can disable studies again after your add-ons
have been re-enabled.
They are working on a general fix that doesn't need to rely on this and
will keep you updated.