Examine source code of Wikipedia First

{
  "manifest_version": 2,
  "name": "Wikipedia First",
  "version": "1.0",
  "description": "Reorders Google search results so Wikipedia is on top.",
  "icons": {
    "48": "icons/wiki-first-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/search*",
        "*://duckduckgo.com/*q=*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "wikifirst@mzza.xyz"
    }
  }
}