<i>...be passing the burden onto others without solving much.</i><p>The burden of what? Deciding what video content is acceptable? Like I said before, that should not be Mozilla's role, but it's the one they've taken on.<p><i>they wouldn't be aware of patent issues and wouldn't care</i><p>Restricting them to Theora doesn't change this, as sites will continue to deliver h.264 through Flash to user agents that don't support it natively. I contend that Mozilla's approach to "educating" users about these issues is a <i>bad one</i> that <i>fails</i> to educate.<p><i>there are also big websites using theora such as dailymotion or wikipedia</i><p>DailyMotion also uses h.264 for every other platform. Wikipedia's reasons for using Ogg are very specific to Wikipedia's aims. Neither of these constitute a good reason to <i>artificially restrict</i> users to only Theora.<p><i>But there is a huge differene between a html tag and a plug-in.</i><p>Yes...and? What's your point?