Browser extension that shows who's online on Aww Yeaa servers (Team Fortress 2 game)
Firefox add-on: https://addons.mozilla.org/en-US/firefox/addon/lets-play-tf2/
Chrome extension: https://chrome.google.com/webstore/detail/lets-play-tf2/encnhjnikcfaidjabljiojiifmjkjbph/
