This is a new features comes for YouTube from Firefox. The name of the feature is YouTube IT, which allows us to search the selected text in YouTube site.
There is no need to explain you about YouTube, as you know it is the biggest free video sharing website, which lets its users to upload, view and share video clips. In this site, videos can be rated by the average rating and the number of times a video has been watched and are both published.
Click to Source and to use this Add-On
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