Works perfectly and I think I love it but unfortunately it requires private windows access "due to a Firefox update" and I am not sure I like it. So I give it 4 stars instead of 5 for the private access thing.

Very simple and just works by enabling disabling Firefox proxy settings. There is one small issue though, proxy switches on automatically when browser restarts even if it was disabled.

Ben: did you follow the directions in the add-on description

Me: Yes, I did try that, still it turns on (the button becomes green) after restart. I would expected it remember the last state and restore on restart.