Examine source code of JSAddFree

{
  "manifest_version": 2,
  "name": "JSAddFree",
  "version": "1.4resigned1",
  "description": "Supprime les dernières pubs de J*pscan.",
  "content_scripts": [
    {
      "matches": [
        "*://*.japscan.com/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8fc4194f-7a74-48d0-a7ad-937f36c50655}"
    }
  }
}