YouTube ALL HTML5

Play all videos on YouTube with your preferred settings (size, quality, playback rate, …) without cookies using only HTML5.

• Automatically change the size of the player and the resolution of the video
• Force HTML5 in cases when YouTube still defaults to Flash
• Start videos paused (always, when not in a playlist, when in a background tab)
• Open video links without the attached playlist (context menu entry)
• Features for users that don't keep cookies:
  • Automatically set volume and playback rate
  • Disable autoplay of recommended videos
  • Hide video annotations

All features of the add-on can be individually configured in the settings (about:addons). These are also directly accessible through a button on every YouTube video page.

Build

The add-on can be built using jpm:

jpm xpi

This creates an unsigned add-on. To build a signed version, you have to change the add-on id and submit the add-on to Mozilla Add-ons for signing.

Develop

You can run the add-on directly in Firefox with a fresh profile and get log messages on your terminal:

jpm -b firefox-dev run

Currently firefox-dev has to be an aurora (dev) or nightly build of Firefox, because of a bug in jpm.

Use

You need a current version of Firefox with support for MSE and VP9 or H264. You may have to install ffmpeg on Linux. Without MSE, only 360p and 720p videos are available.

YouTube provides a test site that checks support for the various pieces necessary. If some element is missing, check the following Firefox settings:

• media.mediasource.enabled
• media.mediasource.webm.enabled
• media.mediasource.mp4.enabled

Attribution

Thanks to Raylan Givens for the hint at emulating IE, Alexander Schlarb for his patch which makes the add-on work with Firefox's click_to_play, Alex Szczuczko for implementing the "pause on start" function and timendum for his work on embedded videos.

Also thanks to Jeppe Rune Mortensen and Yonezpt for their work on YouTubeCenter.

Licence

This add-on by Klemens Schölhorn is licenced under GPLv3.
The modified HTML5 Logo by W3C is licenced under CC-BY 3.0.