I did not knew that they have already released the browser,is it the mobile version you are talking about.The problem with BAT is that people jumped into the coin when it hit the market as no one got the opportunity to purchase during the ICO period and then people started dumping it ,as simple as that,we could see any movement if the business model clicks.
the browser's been out for ages. i remember trying it when it first launched. i uninstalled it a few hours later as there wasn't enough functionality for me. maybe it's improved now.
regardless of that i wonder whether one single ico will ever deliver anything worth shit. they look to me like the modern equivalent of all those country coins that were around a couple of years ago. nothing came of them either.