Prioritization that I'd like to suggest for Firefox, driven by needs of society (from high to low): 1. Representing the public interest wrt Web -- especially fervent respect for privacy in the browser, almost as much emphasis on security, fighting commercial excesses around de jure and defacto standards, and social equity within the scope of what Mozilla does (e.g., software accessibility, encouraging all volunteers)…
Yeah, I would say I think these are actually a good thing as long as the cost-benefit ratio is acceptable and it doesn't compromise core efforts (people have asserted this kind of compromise has been happening, but rarely with any coherence or substantiation).
I would consider the example of Opera in its heyday - whether it was Turbo, "widgets", extensions, or Unite, which in my opinion was a triumph of originality and innovation that went unsung. Those are good when done right.