Yeah I've had some disappointments with Mozilla over the years, but as this point I use it as my main browser in part because I don't want there to be a monopoly with Blink (and Webkit) rendering engines.

And Firefox is honestly still quite good. I have to open up another browser once in a while, but I use Firefox for 99% of my browsing on macOS, Linux, and Windows (mainly Linux these days), including a lot of web apps.