This add-on hides comments everywhere and shows only the ones you want to see.

The addon has several lists. The first of these lists is a blacklist - the comment blocks on any website you visit.

This list contains a lot of websites you're aware of. It's mainly used to block certain comments and spam. The list can be found under the "Blacklist" option.

The other list is a whitelist - only the comments you want to see are shown on a website. It's mainly used to allow them on certain sites.

You can also block a specific comment by selecting the one you want to block on a website. The comment will still show up on a website you visit if you do not block it, but it won't be displayed on that site.