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This explains how to diff Firefox and Tor Browser: https://blogs.gnome.org/muelli/2018/12/the-patch-that-converts-a-firefox-to-a-tor-browser/
A slightly different approach would be to port Orbot:
https://support.torproject.org/glossary/orbot/
Orbot on Android channels all of the device's traffic through Tor. No application changes are necessary. This would benefit not just Web but everything on the Librem.