Show basic Open Graph tags
The Open Graph protocol enables any web page to become a rich object in a social graph. It can be achieved by placing numerous meta-tags in the page's header. This extension retrieves and displays few of them, namely:
If 'og:title' or 'og:description' are omitted, then values of standard 'title' and 'description' meta-tags will be displayed respectively. 'og:image' if exists, is displayed graphically.