The AVI video is nice but most people will not know how to address the issue of the missing Divx plugin. It's not a Firefox versus plugin issue, it's just that the end-user needs to install the Divx plugin. Divx is nearly a decade old and the browser plugin for Firefox and IE has existed since 2005 so it's definitely not a new thing.
To the question/comment of Pentax and indoor shooting -
There are quite a few of us in these forums that shoot weddings and other evening events with Pentax. Both the K20D and the K10D have served me well over the past few years and I certainly expect the next Pentax model I invest on to continue serving me just as well.