Examine source code of -Australian Flag-

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "__Australian Flag__",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(249, 249, 8, 0)",
      "toolbar_text": "rgb(244, 247, 248)",
      "frame": "rgb(53, 108, 172)",
      "tab_background_text": "rgb(247, 241, 241)",
      "toolbar_field": "rgba(249, 249, 249, 0)",
      "toolbar_field_text": "rgb(246, 249, 249)",
      "tab_line": "rgb(253, 26, 6)",
      "popup": "rgb(249, 245, 245)",
      "popup_text": "rgb(3, 4, 4)",
      "ntp_background": "rgb(251, 251, 251)",
      "tab_loading": "rgb(253, 26, 6)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2d7be53f-f5a4-4cff-af7b-54b51ea85f5e}"
    }
  }
}