The problem was/is, they take the money their primary product brings in and invest it into some arguably bad, or at least irrelevant, ideas rather than just reinvesting most of it into Firefox and services consistent with what Firefox represents to users. Part of the reason Firefox lost so much market share was that for several years it had been seriously neglected (presumably so that Mozilla could focus on those arguably bad ideas) while the competition continued to improve. (hint: the #1 metric is performance) They seem more interested in playing the role of a nonprofit quasi-startup and social issues advocate than maintainer of the most viable and valuable open source browser.