Examine source code of NetClear

{
  "manifest_version": 2,
  "name": "NetClear",
  "version": "1.2resigned1",
  "icons": {
    "48": "icons/beasts-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentscript.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9709cf31-4a07-4f9a-982b-ff7b9a1328f1}"
    }
  }
}