Was using Tiny 10/modified Windows 10,but switched to Linux Mint beacuse of low system requirements and low resource usage,as I have 15 year old PC

Fennec F-Droid is based on the latest Firefox release (codenamed Fenix)

https://github.com/Alex313031/Thorium-Android There is this browser it supports arm32, I don’t see support for armeabi v7a, I don’t know will it work, not really familiar with tech side of that

https://www.viayoo.com/en/ This is browser for older devices, very lightweight, even managed to install older version on Android 2.3.4

https://f-droid.org/packages/org.mozilla.fennec_fdroid/ And this is Firefox fork, maybe it will run more smoothly than Firefox