Examine source code of Fun-c

{
  "manifest_version": 2,
  "name": "Fun-c",
  "author": "Hakamae",
  "version": "1.0.0.7",
  "description": "Fun-C vous reverse une partie du montant de vos achats ! Soyez prévenu lorsque le marchand que vous visitez propose un CashBack.",
  "icons": {
    "16": "16.png",
    "48": "48.png",
    "128": "128.png"
  },
  "browser_action": {
    "default_popup": "index.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "jquery-3.4.1.min.js",
        "handlebars.js",
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "templates.html",
    "jquery-3.4.1.min",
    "handlebars.js",
    "contentGlobal.js"
  ],
  "permissions": [
    "storage",
    "notifications",
    "tabs",
    "activeTab",
    "file://*/*",
    "https://*/*",
    "http://*/*",
    "https://www.google.com/_/chrome/newtab*",
    "webRequest",
    "<all_urls>",
    "http://fun-c.com/login/connectsecurWS.php",
    "https://hakamapps.com/"
  ],
  "applications": {
    "gecko": {
      "id": "service.clients@fun-c.com",
      "strict_min_version": "57.0a1"
    }
  },
  "content_security_policy": "script-src 'self'; object-src 'self'"
}