i'm really bad at letting things go.
surely, somebody is still supporting xp?
k-meleon? no. but, i tried the last available version from 2015 anyways, and it wouldn't load the codec. i don't know why, but i'm not the only person with the problem.
if there's a good html5-ready firefox fork that still supports xp, i can't find it.
i think the problem i was having with chrome was that the early versions didn't have tls 1.2. that clicks in with v 29. so, let's give that a run.