Hi, as the email says, Firefox 115 is an older and unsupported version for Discourse. I wouldn’t really recommend using any 3 year old browser regardless of what you want to do with it.. but that warning is kinda in place for a reason. I’m not too sure how well Discourse would work there, but please update your browser if possible instead of trying to get around the wall.
Just because you can do something doesn’t mean you should 