A browser extension that adds a browser icon to show if Hackerspace.gr is open. Is that's the case a counter is added to it's browser icon.
If clicked an interface popup is displayed with the contents of hackerspace's main page.
The webextension polls hackerspace.gr's SpaceAPI every 15 minutes to check if it's open.
You can currently download it for Firefox via: https://addons.mozilla.org/en-US/firefox/addon/hsgr-status/ and for Chrome via: https://chrome.google.com/webstore/detail/hsgr-status-checker/aibkdcnjkbkemgonmacfmeljoemlohlc
It's compatible with the GNU/Linux,MacOSX,Windows versions of these browsers