Not really? COLRv1 only officially landed in OpenType 1.9 with some changes slated for 1.9.1 - OpenType is a consortium consisting of many players, none of them

Not really? COLRv1 only officially landed in OpenType 1.9 with some changes slated for 1.9.1 - OpenType is a consortium consisting of many players, none of them implementing things until the spec is actually official. Except, of course, when it's some company's own suggestion: MS will early-implement support for new features they themselves propose, Adobe will early-implement support for new features they themselves propose, and in this case Google's engineers had it implemented before it was officially accepted because they proposed it. Mozilla (and everyone else) waited until the draft become part of the spec, then had to spend the time implement a (non-trivially complex) new rendering pipeline, and make sure that works properly. COLRv1 fonts should work perfectly fine as of Firefox 107.