They're kind of shifting more from technology into politics. I heard they were cutting employees and divisions a lot.
I know former employees have to sign a waiver not to talk about their layoff, but why hasn't Mozilla's layoffs gotten any press, but startups do?
http://www.glassdoor.com/Reviews/Mozilla-Reviews-E19129.htm gives a clue.
http://core0.staticworld.net/images/article/2015/07/firefox-...
That's not what your linked chart shows. First, the chart is a % market share, not raw user counts. Second, ~18% down to ~13% isn't really "almost half" anyway.
Recent versions of Firefox have introduced third party plugins (like pocket).
After the Eich thing, they lost the "hacker" cred and their talent was pretty easy much poached. Further, the concept of merit - overlooking the political in lieu of skill / talent - is no longer a core value of the organization. [1]
Recruiters were all over linkedin and taking away the best talent left and right.
It seems very reasonable to interpret that whole situation as Mozilla acknowledging the importance of politics over technical leadership--fair or not, when you broadcast your realpolitik that hard, you're gonna lose people.
Hacker culture may not necessarily be aligned with Eich's personal views / situations. But crucial underlying concept is ignoring nebulous things like that. So taking action / reforms based off the premise feels like a Chesteron's fence [1].
[1] https://en.wikipedia.org/wiki/Wikipedia:Chesterton%27s_fence