This addon replaces the old Flash based <embed> tags with HTML5 iframes, including playlists and videos with monetarisation enabled.
Just install the addon and all embedded YouTube videos are now shown as HTML5. No need to disable Flash.
Note that many videos on YouTube are only available as H264 and thus will only
play with newer versions of Firefox.
Under windows set media.windows-media-foundation.enabled to true and under
linux set gstreamer.enabled to true to enable H264 support.
Visit https://addons.mozilla.org/en-US/firefox/addon/html5-youtube-everywhere/
This addon was built with Mozillas JetPack SDK, so building it is as simple
as running cfx xpi. To build it with support for Android, use cfx xpi --force-mobile.
Thanks to [Paul Battley] threedaymonk for the userscript and to [Klemens Schölhorn] klemens for his work on [YouTube ALL HTML5] ff-youtube-all-html5
This addon by Riku-Pekka Silvola is licenced under GPLv3.
The modified HTML5 Logo by W3C is licenced under CC-BY 3.0.