Examine source code of Dark Orange Gradient

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Orange Gradient",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgb(21, 21, 21)",
      "toolbar_text": "rgb(164, 164, 164)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 124, 0)",
      "popup": "rgb(18, 18, 18)",
      "popup_text": "rgb(255, 255, 255)",
      "icons_attention": "rgb(255, 124, 0)",
      "ntp_background": "rgb(0, 0, 0)",
      "tab_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 124, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{64a24daa-748b-4131-98e1-4cec4a86c195}"
    }
  }
}