"...'Ogg' is a wrapper that ties together 'Theora' encoded video and 'Vorbis' encoded sound. Together, Ogg Theora+Vorbis give users a way to see movies on your computer. Ogg Vorbis+Theora are not known to be encumbered by any patents (the only applicable patent on Theora’s predecessor, called 'VP3', was licensed for everyone to use in any way they want).

the and tags along with native support for Theora video and Vorbis audio are currently enabled in the Firefox nightly builds. This will ship in Firefox 3.1 Beta 1 coming later this year. This is not new news but I did want to provide my perspective on why this is important[...] Download a Firefox nightly build here and test it out here or on Wikimedia Commons.

"It was announced at the Firefox Plus summit today that Firefox will include native Theora and Vorbis support for the HTML 5 media elements. So and will support those codecs built into Firefox itself..."

HTML5 spec is expected to introduce new audio and video capabilities into the HTML language. However, it seems that Nokia and Apple have succeeded in removing Ogg Vorbis and Theora support from the current draft which decision has caused lots of heated political discussion. Some critics claim that the decision is mostly based on reluctance to back a standard that has no provision for including DRM, while others have mentioned potential patent uncertainties as the main reason not to back Ogg Vorbis and Theora.

"The Free Software Foundation has started a new campaign to convince people to support Ogg Vorbis with PlayOgg.org. Other formats (such as MP3, AAC, and many others) are patent-encumbered or only available with proprietary software. You shouldn’t have to lose your freedom to control your computer just to play audio and video..."

"...As some of you Neuros old timers may recall, we were the first to port the Ogg Vorbis audio codec to a portable HDD audio player. Now it's time, hopefully, to do the same with the Ogg Theora video codec..."

"...User agents should support Ogg Theora video and Ogg Vorbis audio, as well as the Ogg container format..."

"Increasingly proprietary evil software companies like Microsoft, Apple, and Adobe are pushing video and audio formats that restrict access and restrict software developers, but there is an alternative that can be played on all computers without restriction — Ogg..."

Video and audio support will soon be built directly into Firefox, by way of the free Vorbis and Theora codecs, and Mozilla is using the opportunity to advance multimedia accessibility for hearing-impaired and seeing-impaired users.