Examine source code of Summatim

{
  "manifest_version": 2,
  "name": "Summatim",
  "description": "Watch faster!",
  "version": "1.1.6",
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwoBNuNoOmXZTaJeXLf75StKWhEhF1aN7/D2rfUo2gtCwmcQG260xZlPjbIuzDdHsJg2fFK5ZGX0e7V8AFmVfRhnDVy8mFShHHMPskqxLdzbhxvDIh/QsFZ8pkhGhEfisT6nskHkR1F7hNRXlsOovwP2iB/U/kmySvUa8asedoxcaoRHVVhAUiK2tfCGa5J4QxCS3D2lC+WEmwRx2Q3VOvV94KJcEx63vTB2liuemqJHLM8jkZFWtbgjbmhYGe7NC91knTbvkFxCSZVp+iQ7xjOcqW3FKLe8SBzDEY5ZUtWfdZ8Pi2TIrY27ffBK7jYz7cVjBb0snSOzMdkumiyuG+QIDAQAB",
  "icons": {
    "128": "summatim.png"
  },
  "web_accessible_resources": [
    "static/wand.svg",
    "static/externalLink.svg"
  ],
  "permissions": [
    "identity",
    "https://summatim.app/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7310e740-b28f-4d26-98f2-0fb98e8c62bc}"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.youtube.com/watch*",
        "https://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ]
}