> By passing this on to Mozilla and discontinuing Tor Browser, you're going to inherit the innumerable issues in their code base.
What issues exactly? Tor Browser = Firefox ESR + some patches + some other stuff and tweaks. Before the release of the next ESR TB devs rebase and submit these patches to mainline Firefox, that's why you have prefs like privacy.resistFingerprinting and privacy.firstparty.isolate in mainline Firefox, see: https://wiki.mozilla.org/Security/Tor_Uplift
What issues exactly? Tor Browser = Firefox ESR + some patches + some other stuff and tweaks. Before the release of the next ESR TB devs rebase and submit these patches to mainline Firefox, that's why you have prefs like privacy.resistFingerprinting and privacy.firstparty.isolate in mainline Firefox, see: https://wiki.mozilla.org/Security/Tor_Uplift