HackerCreep от Giacomo Lacava

As you browse Pinboard, this add-on will tell you if a link has already be submitted to HN and link to the comment thread; if it doesn't exist, it will let you post to HN easily. "Merging Pinboard.in and HackerNews to bring about Armageddon. "

Вам понадобится Firefox, чтобы использовать это расширение