That's amazing! I'm already on FF on Android and didn't realise they introduced it. Thank you so much. I'll finally be able to see the small images on medium and substack!

The original android browser had something much better, zoom until the size was right, double tap to reflow to fit

The new one has an extension that reflows on zoom. https://github.com/emvaized/text-reflow-on-zoom-mobile, it is quite useful.

Nice, I wouldn't want it to be automatic after pinch but that looks promising and I'm sure could be modded, maybe pinch zoom and then if you keep holding the two fingers without moving much for X amount of time it reflows

Yeah, it is sometime annoying when text reflows if you only want to look closer at an image. But most of the time it's not really an issue, you just need to reposition. Maybe give it a try anyway :)

Opera Android does support reflowing.

Unfortunately there is no per-site override. So you get to the occasional site that you don't want to zoom (like a game where the zoom gesture does something in-game) that is unusable with this global setting enabled :(