Ideally, you don't need a "turn off" button. If you find the need to add a Disable button, the feature you're adding maybe already too on-the-nose.

How about if I need an AI to read the page, I could just right-click and select? It's the same way how the screenshot feature currently works.

(Wait, I just right-clicked and discovered there's a AI item on the menu. Maybe it's already how it works? If so, then it's not very on-the-nose and I can accept it existing)

> The bulk of Mozilla’s revenue coming from its Google search deal.

Just show a donation message already. If Wikipedia can collect that much donations just for hosting a set of websites, Mozilla, who's doing some really important work for the Internet and maybe humanity at this point, can only collect more.