Examine source code of Restore Old Google Search

{
  "manifest_version": 2,
  "name": "Restore Old Google Search",
  "version": "1.0.1",
  "description": "Automatically applies the 'Web' filter to remove generated content from your search results",
  "permissions": [
    "*://*.google.com/search*",
    "webRequest"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/search*"
      ],
      "js": [
        "webfilter.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{697cab6a-6f21-4091-b74c-d6adf5648c6e}"
    }
  }
}