I'm sorry but I couldn't disagree more with this comment. I don't have stats on Firefox or Chrome (or even the native browser) usage to hand, but I really think these are largely irrelevant.
1) Most people experience most of the "web" on their phones via a non-browser. This may be by clicking on a shared link within the FB/Twitter/WhatEver app and seeing it inside an integrated WebView, or it may simply be viewing content normally available via the web through the lens of an app presenting the "same" content "natively". Either way, the point here is that browsers have had less of a role.
2) For a comparatively new OS (Android is ~10 years old, modern Desktop OSes being 30+) people browsing the web directly are going to stick to the default. They're going to downloads apps for things their phone doesn't already do; for webpages, it already has an app for that. Android Browser is the "Blue e" here.
The above may not be the case for the typical HN crowd, but it's quite naïve to think the majority want and act the same as we.
I am hopeful that this trend is changing - that slowly dedicated mobile web browsers are becoming a more viable option - but certainly this was not the case when Fennec was launched. The best we could hope for was for Chrome/Safari to gain ground over "apps". Mozilla's offerings never stood any real chance of being super successful in this early climate and tbh FirefoxOS, ill fated as it was, was probably the least worst chance they had to do so.