You are going to block this site. This will do the following:
- You will no longer see this site in searches.
- Site will no longer see your site in searches.
- Site will not be able to comment on your site profile.
- Any comments this site has posted to your profile will not be displayed.
Are you sure you want to do this?
You should add "extensions.htmlaboutaddons.enabled" preference to the list. It disables the annoying 'recommended addons' list whenever you go to the addons page.