Examine source code of Midnight Purple Gradient

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Midnight Purple Gradient",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(8, 11, 33)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(2, 2, 7)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(4, 0, 0)",
      "popup": "rgb(40, 13, 137)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(46, 15, 173)",
      "button_background_hover": "rgb(46, 9, 214)",
      "frame_inactive": "rgb(47, 10, 214)",
      "ntp_background": "rgb(47, 10, 214)",
      "popup_border": "rgb(13, 3, 56)",
      "popup_highlight_text": "rgb(46, 9, 214)",
      "popup_highlight": "rgb(255, 255, 255)",
      "tab_selected": "rgb(4, 0, 22)",
      "toolbar_field_border_focus": "rgb(46, 9, 214)",
      "tab_loading": "rgb(4, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a49e2fe8-28a6-44ff-b9ed-efdc84583feb}"
    }
  }
}