The decisions taken by the Mozilla Corporation for the past years make them look like they've completely lost control of themselves. I don't feel like I can trust them at all. I don't want to know what they are going to pull off next week, so I've decided they won't execute any more code on my machine.
Well you gotta pick your poison. It's either them or Google. To be honest, "poison" is too harsh. Mozilla has done a few stupid things, but they're far more trustworthy than other Internet players.
Firefox has worse performance than Chrome and I don't trust Mozilla, so unfortunately using Firefox is not an option for me.