Gamivo and Kinguin, mostly. Also mediafire. Mediafire keeps saying “this form has been idle for too long”. All the browsers that have some kind of track blocking have this problem with these sites, regardless of the engine. Only Chrome and Chromium don’t have that feature and I have absolutely no problems to login to my profile.

Sounds… disappointing, really. While the feature of track blocking sounds appealing at first, that feature is the main reason I abandoned Firefox (after 15 years of using it) and all FF-like browsers that have it. More and more websites stop functioning properly with tracking blocked and I can’t login to my profile. With these particular sites I have nothing to worry about tracking but unfortunately even with disabled tracking protection, they still refuse to let me log in. It’s unlikely that the websites would remove the tracking functions, so until the developers of FF and FF-like browsers find a way to circumvent this problem with logging in, I don’t see a reason for me or anyone else to use such a browser.