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There are a lot of really stupid/trolly/fake videos on YouTube. I'd like to blacklist them forever when I see them, so I don't accidentally click on them in the future, and maybe block the uploader, too, to avoid others. Is there any way to do this? Greasemonkey script? Adblock? Firefox extension? Proxy site for Youtube?

Something like BlockSite would be good, in that it disables hyperlinks to specific URLs, but ideally it would hide everything related to those videos, thumbnails, etc., not just disable the links. Also last time I tried it, BlockSite was buggy.

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There is no way to block a video within YouTube. You can block a user though by navigating to the users profile and clicking block user.

If you are looking specifically for a browser extension then please flag this question for migration to SuperUser. (Browser extensions are off-topic here as per the FAQ)

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Blocking a user does not seem to hide their videos – endolith Nov 8 '11 at 14:50

if you're a firefox user, there's an add-on called youtube ratings preview. it shows the percentage of ratings on both search results and recommended videos on video page, but not on 'load more suggestions' results.

not the ideal i guess, but it helps.

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This doesn't solve my problem, but I upvoted it because it at least helps with it. – endolith Sep 26 '13 at 20:12

Perhaps this might help: http://userscripts-mirror.org/scripts/show/156278.html

This script removes youtube users you choose from appearing in:

-Recommended Channels tab

-Recommended/related videos

-Search results

-My subscriptions/What to watch (if someone you are subscribed to likes/favorites a video from them)

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