Examine source code of Mangaread-Oled

{
  "manifest_version": 2,
  "name": "Mangaread-Oled",
  "version": "1.3.1",
  "description": "Make mangaread.org oled.",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.mangaread.org/*"
      ],
      "css": [
        "oled.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e749f82b-eea7-4256-b956-7dd0a1fddd93}"
    }
  }
}