

Have you tried Obtanium? Allows to download and update from github, among other sources. There’s even a site with source configs that’s very helpful, and includes firefox.
https://apps.obtainium.imranr.dev/
Alternatively, Fennec is basically firefox and it’s on f-droid.
I’ve been in India multiple times fur work (not UP). The traffic there is insane. There’s a set of unwritten rules you have you follow, and a shit ton of written ones you must ignore in order to survive.
I’m not joking when I say that stopping in a zebra crossing for pedestrians to walk would get you in an accident, because nobody expects a car to stop for people.