To this day I have encountered several sites (sort of public, behind logins) that refuse to load if "Gecko" is in the user agent and display variations of "This site requires Google Chrome or Microsoft Edge to work. Please install one of these browsers and ensure it is up to date to proceed."
A user agent spoof extension solves the problem because there's actually nothing used that Firefox doesn't support. Maybe there was, one day, but someone forgot to keep up, or didn't want to.
This has happened for me within the last 3 months with both a widely known financial application provider rhyming with "I'm a twit" and an educational software provider rhyming vaguely with "Crack jorts"
A user agent spoof extension solves the problem because there's actually nothing used that Firefox doesn't support. Maybe there was, one day, but someone forgot to keep up, or didn't want to.
This has happened for me within the last 3 months with both a widely known financial application provider rhyming with "I'm a twit" and an educational software provider rhyming vaguely with "Crack jorts"