Comment Barber משתמש Firefox‏ 12933349 מאת

This add-on makes it easier to focus on the topics you care about in comment threads.

There are two features:
1) Add a star to comments from names on a whitelist. This makes it easier to skim the page and find posts you are more likely to care about.
2) Mute/hide comments from names on a blacklist. Once a commenter is muted individual posts can still be expanded but they will be hidden by default.