"To provide this fix on short notice, we are using the Studies system. This system is enabled by default, and no action is needed unless Studies have been disab

"To provide this fix on short notice, we are using the Studies system. This system is enabled by default, and no action is needed unless Studies have been disabled. [..] It may take up to six hours for the Study to be applied to Firefox. To check if the fix has been applied, you can enter “about:studies” in the location bar... " https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/ https://blog.mozilla.org/addons/2019/05/04/update-regarding-...