I'm not sure where you think Firefox is getting new adoption. Enthusiasts will try both it and Chrome and go with whichever they prefer, but the muggles are now being smothered in Chrome on a lot of Windows notebooks and all Android devices since 4.2, and Chrome is absolutely good enough to keep them from going through the mental gymnastics to realize what a web browser is, research alternatives, install Firefox, and know the difference between the word "Internet", the swirly icon, and the Fox globe one while realizing they mean different things.
Unless Firefox can get distributor deals with Dell / HP / etc the way Google has to get Chrome preloaded (between that and its default-on-Android status is what is rapidly pushing its market share) nobody has the pressing need to go out of their way going borderline door to door replacing IE6 with Firefox on everyones computer like they did in 2005-2008.
Unless Firefox can get distributor deals with Dell / HP / etc the way Google has to get Chrome preloaded (between that and its default-on-Android status is what is rapidly pushing its market share) nobody has the pressing need to go out of their way going borderline door to door replacing IE6 with Firefox on everyones computer like they did in 2005-2008.