Ah, looking at the source, apparently it's meant to have a %u or %U, not a %s.
In that case it gets substituted OK, but with extra 'quotes' which prevents
firefox from parsing it OK:
firefox -P default -remote openurl('http://google.com/', new-tab)
--
Custom browser does not receive URL at %s
https://bugs.launchpad.net/bugs/312126
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