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Missing Chrome's 'Go to URL' feature
(sh.itjust.works)
A place to discuss the news and latest developments on the open-source browser Firefox
I don't think .co versus .com is the relevant factor. I can select xample.co by itself, but not as a substring of http://www.example.com. The rules seem so arbitrary and context-dependent that it behaves more like a dice roll than a usable feature.
If a selection to URL feature cares about TLDs, IP addresses, or text beyond the selection range, then it's operating at the wrong abstraction layer. (well, technically Goto foo has a couple lines of code to [bracket] bare IPv6 addresses, but that's not core functionality.)