I use edge for MS Teams, office 365 and anything that use microsoft ssO on my linux works computer. I don't want to taint my firefox profile/experience with microsoft stuff, and I figured the microsoft stuff will be better tested on edge than anything else, especially teams videocalls. Since my company mandate the use of microsoft stuff I decided to put everything behind Azure SSO with Edge for linux and keep everything else on firefox.

The only thing I use behind Azure SSO that is not on edge is AWS because I take advantage of the multi containers extension to run several profiles in parallel. But for that I use another browser, librewolf.

I use Edge sometimes, I like the tabs on the side and the PDF reader supports annotating the PDFs with text and drawing which is a great feature and keeps me using it for reading. Otherwise it's a Chromium browser, so it's not a hardship to use it. Too bad they removed the EPUB reader functionality when going Chromium.

The PDF reader is also the reason I use it. Switch it to cover mode and span the pages. It's better than Chrome's reader, IMO.