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