I exclusively used Firefox for 20 years. I moved over to Edge and haven't looked back. Mozilla and the people still using it seem to think maintaining your own rendering engine with Gecko is somehow keeping the internet free. Wrong abstraction layer of freedom to worry about. It's the most bizarre thing I've ever seen. It should have moved to Webkit or Blink many years ago, and focused on user experience. Such as extensions to keep MV2 addons working, and even expanding on the capabilities, like the old XUL/XPCOM Firefox extensions. Those things are why people like me used Firefox, not because of all the money and work put into Gecko. Which is just redundant in the end.
Moving to Blink or Webkit, keeping MV2 and XUL, was where the effort should have been placed. Also, I never understood Pocket or any of their other decisions. Now it's being floated to ban adblockers. Poorly run organization that given its direction and decisions, deserves to die.