every browser HAD text reflow at least around 2010~2012.
for whatever reason, they all removed it. Android stock had text reflow (and inverted color night reading). then on 2.3.3, gone. now they don't even have a stock browser. they ship with chrome, installed as a system app.
firefox started with awesome text reflow. then i think on fenec v16 they screwed up everything when moving to the Reader feature just to clone safari, safari for f* sake...