Firefox is comparable to Chrome in terms speed and features. However, Mozilla doesn't have the same incentive to collect and use data on their customers that is inherent to Google, an advertising company. In addition to that, Firefox is fully open source, unlike Chrome which contains closed source components from Google.

... and, as I mention above, the Mac version has been pretty bad over the last few months, enough to drive users away (including me).

Really? I've been using Nightly exclusively on my laptop and haven't noticed any problems. Maybe just lucky.

Edit: Oh, the mac version of Chrome. Gotcha.

Yeah, I'm still on Chrome on various Windows VMs and PCs with no problem.

To me Firefox wins over Chrome for interface customization.

Can't take that "One size fits all" mentality of Chrome.

Why is that an issue? Its just a window to web content.

How is it "just" a window to web content? You never mind things like tabs, bookmarks, the developer console, browsing history or, say, the "Back" button, I guess.

People are concerned about their privacy