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No Flash 0.5.1
Replace Youtube, Vimeo and Dailymotion Flash video players embedded on third-party website by the HTML5 counterpart when the content author still use the old style embed (Flash).
Source code at https://github.com/hfiguiere/no-flash
About this Add-on
This will not change YouTube, Vimeo or Dailymotion. You won't see any change there.
This is to replace the legacy Flash embedding of YouTube, Vimeo and Dailymotion videos on third-party website. Some CMS still do that, older content didn't get updated, etc. Many reasons but this break the open web.
So "no-flash" will do what it can to fix that. It is not a silver bullet, but it works in many case - YouTube being very common.
Also, if YouTube insist that you need Flash to view a video, there is unfortunately nothing much that can be done with this add-on.
-Fix broken add-on starting in Firefox 44.
-Bug #44 - Fix a bug with youtube-nocookie embeds.