Firefox on Android used to have text reflow, then they removed it. Then the crappy extensions were made. I used to use text reflow on Conkeror (Firefox based) on desktop, but a year or two after they disabled it on Android they removed it from Firefox. I agree, I also use Opera on Android, for this feature.
pmontra|9 years ago
Unfortunately the about:config setting for text reflow in one of the last comnents is not in Firefox anymore.
Ironically that page is an example of a page where reader mode doesn't work.