&gt;One has the passion and enthusiasm of well respected open source volunteers behind it, and the other has a sleek high quality shine only our dear corporate overlords could deliver. This is minor, but it sets the mood the for the whole experience of add ons.<p>Doesn&#x27;t Mozilla spend a lot on Firefox development? Like in the hundreds or tens of millions of dollars range? They have very nice and grand offices, lavish even interns with expense paid trips and food, so I don&#x27;t really know what you&#x27;re talking about.<p>[Edit: They spend $212M on Software Development in 2014 alone]<p>E.g. <a href="https:&#x2F;&#x2F;ryanseys.com&#x2F;blog&#x2F;summer-at-mozilla&#x2F;" rel="nofollow">https:&#x2F;&#x2F;ryanseys.com&#x2F;blog&#x2F;summer-at-mozilla&#x2F;</a><p>&gt;Interns at Mozilla, myself included, are truly spoiled rotten. Competitive pay, free travel&#x2F;housing, free snacks&#x2F;drinks and catered lunches every week were really just icing on the massive cake that was my internship!<p>&gt;Oh, and did I mention that Mozilla also sent me to Paris, France?! Yeah, it happened. For my final working week, myself and a handful of the Identity team met up in the Paris office and hacked on Persona, and ate… and drank… a lot!<p><a href="http:&#x2F;&#x2F;www.businessinsider.com&#x2F;inside-mozillas-amazing-office-space-in-san-francisco-2012-3?op=1" rel="nofollow">http:&#x2F;&#x2F;www.businessinsider.com&#x2F;inside-mozillas-amazing-offic...</a><p><a href="http:&#x2F;&#x2F;ngokevin.com&#x2F;blog&#x2F;mozilla-day-one&#x2F;" rel="nofollow">http:&#x2F;&#x2F;ngokevin.com&#x2F;blog&#x2F;mozilla-day-one&#x2F;</a><p>What kind of open source volunteers have perks like these?