Possibly? Though I wouldn’t recommend it. I tried that with xfce once, and it technically worked, but tiling window manager and desktop environments tend to have different aims. A desktop environment like plasma will have everything bundled together and playing well as a whole, while a window manager like i3 will be barebones and expect you to pick out the pieces yourself. DE’s are much more beginner friendly, while WM’s are great if you want to get as much customization as possible. Which will better suit you depends on your needs.

Distro isn’t important for tiling, just the window manager. I’d start with i3 personally, it’s been around a long time, which means the documentation is fairly plentiful.

Oh snap, don’t mind if I do

Sadly not available on Linux, but Arc has the best tab management paradigm of any browser I’ve tried, by far. Pinned tabs with folders, workspaces, and home urls goes hard.

On the other end of the spectrum, I’m very fond of qtbrowser. If you want a keyboard centered workflow it’s hard to beat.

I think Firefox will support both v2 and v3 extensions, so devs can use whichever makes more sense for their project. It has been a while since I looked into it though.