3 points
Workgroups, tab stacking, tab tiling, side by side view of multiple websites which you can interact with at the same time within one window, keyboard only control (if desired) and more.
2 points
Most or all of those are available in extensions and keyboard only I think is in stock FF but I can understand not wanting to install a million extensions to recreate that functionality. I was a die hard old school Opera user but just can’t bring myself to daily drive a chromium based browser.
