I tried that, and no, it didn't help. The problem persists. Even a private window doesn't help. I suspect Firefox is just shitlisted by them.
xcancel has mostly been looping for me too.
are you, by any chance, a bot?
Unfortunately, Firefox is often put in the bot bucket nowadays. Not sure what happened here. It might be because of aggressive privacy settings that are flagged as unusual or suspicious.
Not at all. I was controlling the browser myself as a human, not via any bot.