Examine source code of Sydney Harbour

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Sydney Harbour",
  "manifest_version": 2,
  "description": "View of Sydney Opera House and the 'coat hanger' (Harbour bridge)  with fuzzy buildings and Centre Point Tower in far left corner of Footer image as well as fuzzy Harbour bridge on the right : the fuzzy left section allows you to better read firefox tabs and header indications, etc. but it is not extra-perfect (yet you may also wish to more or less hide some of your selected sites if you put them on the left side of the header...)"
}