[SecurityMatters]

This is not ideological. It is practical. Adobe Flash exposes your system to a variety of vulnerabilities and is unlikely to get much better. Adobe considers making the user vulnerable a feature and they brag about it to people they sell their commercial products to. They also offer an unreasonable license to the player that sensible people refuse to accept. So, if Ogg Theora allows embedded videos at comparable quality for the same bitrate, and websites like YouTube adopt it, then it is a big win for the user. Sensible people can now play videos and we can recommend disabling Adobe Flash and so everyone is a winner.