I've been using it for almost two years now. I love the dark theme and the way they layout the developers tools. However, it's buggy at times especially with the constant updates. It is also much-much slower than a standard Chrome. For the average project, I would use FFDE but when it involves heavy and large JavaScript processing, I switch to Google Chrome.

I have it installed, and I use FFDE for taking screenshots of components (no fizzling around with border cropping afterward). But other than that, nope not using it. Almost all my plugins I rely on are Chrome exclusive. And the few plugins which have been ported behave differently or feel sluggish.

I do like the dark web IDE mode but it's too less of a selling point compared to Chrome.