I decided to try out Edge when I started my current job and was genuinely impressed and stuck with it. We use Microsoft products heavily so I figured it would only be appropriate to use a Microsoft browser to access them. The built in vertical tab support, multiple profiles, etc. it really does a dang good job which is a pleasant surprise
Might depend on where you are in the world, it's not really the case where I am
Twitter, Bluesky, and Mastodon are most common for that format, and Chrome/Safari for browsers. I see more Firefox than Edge, with the exception being locked down work computers