Examine source code of PE Center

{
  "name": "PE Center",
  "short_name": "PE Center",
  "manifest_version": 2,
  "author": "Victor de la Fouchardiere",
  "permissions": [
    "storage",
    "clipboardWrite",
    "tabs",
    "alarms",
    "notifications",
    "https://crawler.victor-de-la-fouchardiere.fr/*"
  ],
  "browser_action": {
    "default_popup": "popup-light.html",
    "default_title": "PE Center",
    "default_icon": "icons/icon_16.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "pecenter@victor-de-la-fouchardiere.fr"
    }
  },
  "icons": {
    "16": "icons/icon_16.png",
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "background": {
    "scripts": [
      "background.bundle.js"
    ]
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+T",
        "windows": "Alt+T",
        "mac": "Alt+T"
      }
    }
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "description": "A web extension which allows to find and copy any tips about the Google Help Center.",
  "version": "3.0.18"
}