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Bug 40432: Prevent probing installed applications

Matthew Finkel requested to merge sysrqb/tor-browser:bug_40432_01 into tor-browser-78.10.0esr-10.5-1

We replicate the same checks that exist in the LoadURI function, except now we check it earlier during the channel creation.

This allows selectively allowing specific applications, as well, by defining a network.protocol-handler.external.* pref (such as network.protocol-handler.external.spotify).

Closes #40432 (closed)

Edited by Matthew Finkel

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