Examine source code of Avocado

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Avocado",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(138, 193, 146)",
      "toolbar_text": "rgb(20, 68, 7)",
      "frame": "rgb(242, 214, 208)",
      "tab_background_text": "rgb(20, 68, 7)",
      "toolbar_field": "rgb(195, 232, 186)",
      "toolbar_field_text": "rgb(20, 68, 7)",
      "tab_line": "rgb(20, 68, 7)",
      "popup": "rgb(195, 232, 186)",
      "popup_text": "rgb(20, 68, 7)",
      "tab_loading": "rgb(20, 68, 7)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{34ca7de5-6f58-4435-84b0-ee2b22d1f7a8}"
    }
  }
}