I really love Proton as a company but this add-on is infuriatingly buggy. Every time I boot Firefox, it will not reconnect and I have gotten to the point where I have to disable and re-install it to get it to work. I never had this problem with Nord and Proton offering a Firefox extension was a big factor in my decision to switch. I have no idea why it won't connect either because the way it is designed means it just sits there in a window with a spinning pinwheel and won't give me any information about what it's doing.