I think something not getting enough attention is the design of the popup itself. It is chock-full of dark patterns (different sized click targets, "not now" dismiss action instead of "No") and doesn't include any way to disable similar "messages" in the future.

It's concerning that someone at Mozilla designed this and didn't see any problem with foisting these dark patterns on their users. This is the kind of user-hostile design I expected from Microsoft Edge not Firefox, which I thought was trying to be a user-respecting alternative.