Yes, compared to Safari. The Safari engineering is very impressive! I think there is quite a bit more to come on the Firefox side though, so hopefully they'll close the gap.
Same, I switched to Safari a couple of years ago. I was initially hesitant, because I used the developer tools in Chrome quite a bit. I was pleasantly surprised to see that the Safari developer tools is very mature, and in some ways better than Chrome.
The reason I use Safari is because Chrome is unbelievably power-hungry. I didn't know Firefox was even worse.