Examine source code of Better Digipad

{
  "manifest_version": 2,
  "name": "Better Digipad",
  "description": "Extension for a better interface on digipad (by Quent_MIN)",
  "version": "1.4",
  "content_scripts": [
    {
      "matches": [
        "https://*.digipad.app/*"
      ],
      "js": [
        "inject.js"
      ],
      "css": [
        "inject.css"
      ]
    }
  ],
  "permissions": [
    "storage",
    "tabs",
    "cookies"
  ],
  "icons": {
    "1024": "up.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{44d2bc57-65fc-4952-88b9-cead44696f6e}"
    }
  }
}