Move about: shouldShowTorConnect logic to the about redirector

We're having to customise the about: redirector for home and newtab anyway, as of #43886 (closed).

So we might as well move the shouldShowTorConnect logic in browser/modules/URILoadingHelper.sys.mjs to browser/components/about/AboutRedirector.cpp. The advantage would be that this would work at the lower-level, so there would be less slip-throughs as in #41769 (closed) and #41529.

It would require some kind of idl interface for what is currently handled by TorConnectParent.

Edited Jul 09, 2025 by henry

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