The Firefox add-on offers YouTube comment filtering, effectively blocking undesirable comments.
This Firefox extension provides several customizable rules to mark comments for removal. You can choose to eliminate comments that have more than a certain number of spelling mistakes, all capital letters, no capital letters, excessive punctuation, excessive capitalization, or comments that don't start with a capital letter.
One of the best things about this add-on is that it is cross-platform and works on Mac OS X, Windows, and Linux. If you want to enjoy a more positive and productive experience on YouTube, consider installing YouTube Comment Snob.
Version 1.3: N/A