My overwhelming feeling is one of gratitude to the devs and people working on Firefox. It's the last bastion of Browser independence with super-high customizability.
I also tend to use Edge over Chrome now. MS has done a pretty good job of making that a nice experience, BUT they are also pushing some less palatable ones. For instance, t used to be simple in any browser to just open a blank tab. You could set _about:blank_ as the default page. Snappy load, no crap.
Try that on Edge now. It's basically impossible from the settings.
So Firefox will always be my main driver. To me one of its killer features -apart from the great extensions- is the ability to send tabs to other instances on other devices, or fetch the tabs or history from another device (if logged under a Firefox account).