Mozilla's interest in keeping web standards open is obvious. Their largest competitor, Microsoft, has for the most part grown IE's user base up both including a copy of it with Windows and by making things like ActiveX and .NET integration difficult or impossible to achieve on other browsers. Seeking to avoid more of that in the future, Mozilla is encouraging the development of the Theora and Vorbis media codecs, along with the Ogg container format. The goal is to make them attractive and easy enough to use for web development, particularly in the streaming video and audio departments.
An open standard for an open web is the goal, and to back up their claim Mozilla is giving the Wikimedia Foundation a $100,000 grant, expressly for Ogg development. This is directly related to other plans Mozilla has, such as native Ogg integration in Firefox 3.1. With a market share as high 21%, that's a big incentive for web developers to use the open format to embed media.
There are obstacles to overcome at every corner. One that is brought up often is how much media giants rely on DRM. While most techies consider it a crutch, companies that sell streaming movies, streaming music and more all believe that they inherently need DRM to protect their content from being stolen. Truth or not, the best way to back up open standards is with action, and Mozilla is clearly doing that. I would very much like to see open standards being used everywhere, wouldn't you?