I have an ephemeral container (systemd-nspawn with -x switch) with almost-default configuration of firefox (only uBlock Origin added) for such websites. After I'm done, I close the browser and everything gets deleted.
Mine has the advantage of the browser processes not having access to anything important, in case of a RCE vulnerability. An attacker would just see a vanilla debian install with no juicy user data, and only the ~/Downloads directory linked from my "real" system.
Mostly, yes. The bonus is you don't use your normal settings + extensions. Which also means ALL websites work, regardless of privacy related settings that might break some websites.
So it's a handy alternative.
I do not, sorry. I have to set up a blog some day, but I have been putting it off because most of the time I can't think of anything interesting to say. :)
Anyway, I was mostly inspired by an article on how to set up Steam in a container - it has all the details, including how to pipe Pulseaudio inside (so in my case, Youtube videos in Firefox can have sound). Except mine is debian-based (so debootstrap instead of pacstrap to populate the container).