Examine source code of Late Night Shift

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Late Night Shift",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-023-f741aad3989b46322a7840a425068429.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(1, 133, 116, 0.3)",
      "toolbar_text": "rgb(255, 131, 165)",
      "frame": "rgb(0, 30, 15)",
      "tab_background_text": "rgb(50, 150, 150)",
      "toolbar_field": "rgb(0, 30, 15)",
      "toolbar_field_text": "rgb(255, 131, 165)",
      "tab_line": "rgb(255, 131, 165)",
      "popup": "rgb(22, 54, 75)",
      "popup_text": "rgb(255, 131, 165)",
      "tab_loading": "rgb(255, 131, 165)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{58e820f0-3531-453b-86bf-f35ee0fc0bf1}"
    }
  }
}