como hago eso?
ahora mismo no recuerdo haber instalado nada que me haya activado algo al respecto
EDITADO:
hecho y ya va ok, que raro, porque se me habrá cambiado...
Hecho con este link:
http://www.trishtech.com/2012/04/disabl ... a-firefox/ Type about:config in the Firefox browser’s location bar.
Click on the I’ll be careful, I promise! button to continue.
Disable HTML5 Video in Firefox
You would see a big list of Firefox configuration entries. Type media in the Search field to narrow down the list only to media related configuration entries. You would be able to find four values : media.ogg.enabled, media.wave.enabled, media.webm.enabled, media.windows-media-foundation.enabled.
Disable HTML5 Video in Firefox
Double-click on all these configuration entries to change their value to false. This would make Firefox report to Youtube (actually to all sites) that it cannot play HTML5 videos, forcing it to fallback to the Adobe Flash format of videos. Now if you open any video in Youtube, they would play only using the Adobe Flash plugin.
If you do not notice the changes in Youtube, then you may try restarting the web browser or clearing out your browser cache.
The steps discussed above were tested successfully on latest version 23 of Firefox browser. Please note that this method not only disables the HTML5 video support from Youtube but also from all the sites that you access using Firefox. If you want to enable HTML5 video support for all websites again, then just follows the same steps – this time switching the values to true.
![[oki]](/images/smilies/net_thumbsup.gif "Ok!")
