My Firefox for some reason stops to color visited link, I already made sure I am not in privacy mode, and 'Remember History' is turned on. And yes I tried to user other browsers, and they all worked, except for FireFox. I also did clean uninstall, then install fresh copy of FireFox, deleted profile folder to remove all preference, but nothing works. This addon is ONLY thing that color my visited link, because native Firefox on my Windows for some reason is broken. Thanks for making this addon!