Is there an HTML5 validator plugin for Firefox?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Romantic Lands Beckon

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Chapters
00:00 Question
00:42 Accepted answer (Score 6)
02:13 Answer 2 (Score 4)
02:45 Answer 3 (Score 0)
03:00 Thank you

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Full question
https://superuser.com/questions/107228/i...

Question links:
[this]: https://addons.mozilla.org/en-US/firefox...

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https://meta.stackexchange.com/help/lice...

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Tags
#firefox #browseraddons #html5

#avk47