Examine source code of Idiocratify

{
  "manifest_version": 2,
  "name": "Idiocratify",
  "description": "Remplace le nom des membres du gouvernement par leurs versions idiocratifiées.",
  "version": "1.1",
  "homepage_url": "https://github.com/Uhter/idiocratify",
  "icons": {
    "64": "static/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*"
      ],
      "js": [
        "js/replace.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "256": "static/icon.png"
    },
    "default_popup": "index.html"
  }
}