Comment by ftaghn

>It might be a specific security setting I've made more restrictive than the default

Probably not.

I recently tried to go back to firefox and eat up some of my gripes with the browser because I don't like chromium's engine monopoly but I had the same issue you had, in my case with some web novels websites that ran cloudflare in maximum DDoS protection mode. Cloudflare would tell me to click to prove I'm human, and the page would just reload in place in an infinite loop.

I ran Firefox on the default settings, and with uBlock (also on default settings). I deleted uBlock, and disabled every option that Firefox has for privacy. Still no cookie. Cloudflare blocked me.

I opened Chrome on the same webpage and not only did it work immediately, but cloudflare didn't ask me to click to prove my humanity, the page just went away on its own without the "challenge" prompt. I had ublock turned on and it caused no issue.

I'm a lesser man, I did what most people would do in this situation: apt purge "firefox*".

I'm a linux user, who used to have a dual boot with windows for video games and who removed the dual boot and stuck with only linux since 2 years ago, I can say, I find being a linux gamer, quirks with proton and all, less painful than browsing the web with Firefox. It's a lost cause. There is simply no way that I am going to recommend Firefox to less technical friends the way I used to in the Internet Explorer vs Mozilla days. I can't see FF ever recovering.