Examine source code of East Coast Connected

{
  "theme": {
    "images": {
      "theme_frame": "ecc_firefox_lighthouse_header.png"
    },
    "colors": {
      "frame": "#b7cbe8",
      "tab_background_text": "#000033"
    }
  },
  "version": "2.0",
  "name": "East Coast Connected",
  "manifest_version": 2,
  "description": "East Coast Connected offers a theme for all those Atlantic Canadians out there!"
}