Examine source code of FYWebedia

{
  "manifest_version": 2,
  "name": "FYWebedia",
  "version": "1.6.0",
  "description": "accès aux sites webedia sans cookie et sans payer",
  "icons": {
    "48": "icons/fywebedia-48.png"
  },
  "browser_action": {
    "default_icon": "icons/fywebedia-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "fywebedia.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2f48f916-2993-4b97-8d62-2b31f8c54304}"
    }
  }
}