Examine source code of Magneto extension

{
  "name": "magneto-extension",
  "icons": {
    "128": "icon.png"
  },
  "version": "1.0.7",
  "description": "Clip anything and add to your magneto boards.",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "notifications",
    "activeTab",
    "storage",
    "cookies",
    "tabs",
    "scripting",
    "https://*.clipper.website/*",
    "https://ent77.seine-et-marne.fr/*",
    "https://mon.lyceeconnecte.fr/*",
    "https://ent.parisclassenumerique.fr/*",
    "<all_urls>"
  ],
  "applications": {
    "gecko": {
      "id": "magneto-extension@cgi.com"
    }
  },
  "browser_action": {
    "default_icon": {
      "128": "icon.png"
    }
  },
  "web_accessible_resources": [
    "tool.html"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval' object-src 'self'"
}