Filter YouTube comments by user.
This extension allows you to blacklist dumb people on YouTube. Just right-click a comment and select 'Blacklist user' from the context menu. After blacklisting someone, you won't see that person's comments. The blacklist is stored locally.
This version (0.4.0) is the first release. Consider it beta software. A basic set of features is finalized, but more work is planned. If you wish to follow the progress, you are welcome to visit the GitHub page. The manual and other related documents will soon appear there too.
An explanation of the permissions required by this extention can be found on the website.