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HTML5 YouTube Everywhere
The addon replaces legacy Flash based embedded YouTube videos with HTML5 iframes and forces existing iframes to use HTML5. Works even with videos that have monetarisation enabled, which would normally fall back to Flash player.
With this addon you can leave your Flash on and it will still work.
!! DISCLAIMER !!
On 16th of April, changes made by YouTube on their site broke the extension's support on site once again. Development of a new version is on progress. For now the extension only replaces YouTube players embedded offsite. Apologies for the inconvenience.
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then please write an e-mail to legacy [at] collector dot org.