Either Firefox is awful on windows or Chrome has something really great that I've totally missed.

Chrome on Linux is just all kinds of unpleasant, it's not even possible to use it at all with my current distro. I don't understand how everyone seems to like it so much.

When I first started using Linux day-to-day, Firefox, at least for me, was an absolute nightmare and didn't run well. I've switched to Vivaldi (Chromium-based, very power-user / I-never-want-to-move-my-hand-to-the-other-input-device friendly) for the moment, but I might just switch to Firefox again, I hadn't heard about the Multi-Account-Container feature, and that might just push me over the edge.

I've switched to FF and am mostly happy but for some reason it's terrible for videos. I'll get long hangups that never happen if I watch the same video on chrome

You can set up a filter to match all emails and have them forwarded to another address. There may even be a specific forwarding setting somewhere in Gmail.