Examine source code of gazania2

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "gazania",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(176, 188, 184, 0.34)",
      "toolbar_text": "rgb(202, 203, 200)",
      "frame": "rgb(103, 198, 198)",
      "tab_background_text": "rgb(156, 158, 157)",
      "toolbar_field": "rgba(225, 233, 230, 0.71)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(255, 221, 0)",
      "popup": "rgb(218, 228, 224)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(255, 221, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{215116fb-bf9c-4c3c-8ba0-0315b679549a}"
    }
  }
}