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Okay, I checked, and as far as I can tell (which doesn’t mean much as I don’t know much about this stuff, mind you) it does seem like I can control outbound rules. However, I don’t know how to find out the IP address of the TV. Additionally, I don’t know if my router is IPv4 or IPv6 in this context, but according to the online spec sheet for my router model it supports both.
That’s what I do. LibreWolf on desktop and Mull on Android, with FF Sync enabled between them. Works like a charm!