The final push to start using Firefox over Chrome on Android might finally be thanks to the enormous selection of add-ons (Firefox's version of extensions) coming out next month. Chrome doesn't offer native support for extensions in its mobile app. Also, better security.
Page on Firefox with unlock: 6 sentence news article.
Same page on chrome: video in the corner, popup blocking 30% of the screen, flashing ads every second sentence, halfway through there's another popup asking you to log in.