Examine source code of Outlined

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Outlined",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(12, 12, 41)",
      "toolbar_text": "rgb(233, 112, 248)",
      "frame": "rgb(195, 142, 201)",
      "tab_background_text": "rgb(118, 85, 121)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(151, 123, 204)",
      "tab_line": "rgb(193, 112, 248)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(178, 98, 183)",
      "ntp_background": "rgb(37, 16, 40)",
      "tab_loading": "rgb(193, 112, 248)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bfb4b46f-428c-4d44-b902-5fd057482a56}"
    }
  }
}