I have really liked the add on, and have it on all of my browsers, at home and work. However, the font changed in the Firefox version, and I can't read it. I am very disappointed. I guess this is a way to get people to buy the pro version? But what seems really odd is that it works just fine in Chrome and Edge without the unreadable font. I don't understand why it is only in Firefox that I have an issue. If this is a bug, I wish they would fix it. I rarely use Firefox anymore because of it, and it used to be my defaut browser.