Examine source code of Black Mountains Sunset

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "blackmountainssunset",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 28, 0, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(73, 141, 141)",
      "tab_background_text": "rgb(230, 230, 230)",
      "toolbar_field": "rgba(233, 229, 225, 0.52)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(191, 157, 116)",
      "popup": "rgba(228, 225, 218, 0.95)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(191, 157, 116)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e9bab9fa-90c3-486e-adc6-3e5cd03a523c}"
    }
  }
}