A good start but FF limitations are affecting it. Howver, letting the Mac variant default to cmd+, (since cmd+; apparently isn't assignable?) is bad and should have been replaced by almost anything else, namely a setting to allow the USER to pick. But the worst shortcoming seems to be that it doesn't save your window titles upon closing Firefox! So when you restart, you have a bunch of windows with the same default names, making it useless. And it can be a pain to go through them all and re-set them properly. Please find a way to store the windows names if FF closes or crashes!