Examine source code of RUSSIAN BLUE

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "RUSSIAN BLUE",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(35, 25, 66)",
      "toolbar_text": "rgb(206, 253, 255)",
      "frame": "rgb(41, 41, 86)",
      "tab_background_text": "rgb(117, 139, 253)",
      "toolbar_field": "rgb(41, 41, 86)",
      "toolbar_field_text": "rgb(117, 139, 253)",
      "tab_line": "rgb(175, 145, 100)",
      "popup": "rgb(35, 25, 66)",
      "popup_text": "rgb(206, 253, 255)",
      "tab_loading": "rgb(175, 145, 100)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{42934633-0a4d-4c3f-ba58-82c961a7f3ec}"
    }
  }
}