Examine source code of Froutify

{
  "manifest_version": 2,
  "name": "Froutify",
  "description": "Remplace le noms de personnalités politiques française par leurs versions froutifiées.",
  "version": "2.0",
  "homepage_url": "https://github.com/dexeis/froutify",
  "icons": {
    "64": "static/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*"
      ],
      "js": [
        "js/replace.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_icon": {
      "64": "static/icon.png"
    },
    "default_popup": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{eb70644e-ada6-44b0-8219-ca391c2da01e}"
    }
  }
}