I think I got it sorted. I tried it on 6 different computers/laptops/VMs/Ubuntu/Windows and it never worked. Then I tried Chrome and after I clicked install I w

I think I got it sorted. I tried it on 6 different computers/laptops/VMs/Ubuntu/Windows and it never worked. Then I tried Chrome and after I clicked install I was presented with a picture of (I assume) you and a "Continue" button. I had never bothered to click on that before, always going straight to the extension button in the top right corner. However, if you don't press "Continue" it doesn't request the permission it needs to work. I don't know if this is possible, but it might make sense to check that tab permission again (for example, when the user tries to block a site). Hopefully that makes sense. Let me know if you need further clarification.