I got downvoted to hell for saying it before, but what Ubuntu and Firefox are up to together is kinda what Microsoft went to court over Internet Explorer for in the 90s.
Firefox is my go-to today, but I'm watching them closely.
Edit: typical fanboy downvotes. The writing is on the wall. Mark my words y'all. In 2035 you'll be saying "get off Firefox" like you're currently saying "get off chrome". I've seen this song and dance before.
Also, look at this super cool not disgusting abomination of a bug that's not a bug. Remap my fucking root directory?