Examine source code of Matte Black Red Edition

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Matte Black Red (Pattern)",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(16, 16, 16)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(47, 47, 50)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(84, 82, 82)",
      "toolbar_field_text": "rgb(255, 251, 251)",
      "tab_line": "rgb(186, 10, 10)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(98, 102, 183)",
      "tab_loading": "rgb(186, 10, 10)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{963c36e2-7803-421e-8e95-986822134272}"
    }
  }
}