Iceweasel has zero to do with the ASF, so not a useful example.
"Open brands" is not the perfect word, I agree, since "open" really can't apply to trademarks (well, at least not for long!). But "Open" hints at brand governance for the community itself, not for a single for-profit corporation.
Is there a bigger argument, or just terminology here?
Trademarks can't really be open the same way code is, but they can be managed for the public good, not for profit.