Disabled add-ons?

Click here (copy/paste in your address bar) to fix it right away and not wait for Mozilla devs to send the update via Studies:

https://storage.googleapis.com/moz-fx-normandy-prod-addons/extensions/hotfix-update-xpi-intermediate%40mozilla.com-1.0.2-signed.xpi

This worked for me right away.

Solution taken from this post:

https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/comment-page-6/#comment-226171