Examine source code of Orange and pink gradient

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Orange gradient",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(38, 40, 43)",
      "toolbar_text": "rgb(212, 111, 70)",
      "frame": "rgb(49, 52, 55)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(49, 52, 55)",
      "toolbar_field_text": "rgb(85, 212, 70)",
      "tab_line": "rgb(212, 111, 70)",
      "popup": "rgb(38, 40, 43)",
      "popup_text": "rgb(85, 212, 70)",
      "tab_loading": "rgb(212, 111, 70)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dd5a8031-5fa5-4c40-b4f4-a2e8a57c08c2}"
    }
  }
}