I don't really get what you're on about. I switched from Chrome to Firefox a couple months ago and... it's great. I don't notice any differences in performance (if anything, snappier) and the only thing that's "missing" that I had in Chrome is that Chrome had all my credit-card and password data associated with my Google account, which, well, that's not something I want Firefox to have.

TLDR: Firefox is a good web browser. It's not failing in the market because it's not a good browser. It's failing because consumers don't seem to actually care one way or the other.