Examine source code of JK-Google

{
  "manifest_version": 2,
  "name": "JK-Google",
  "version": "1.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "zerint@github.com"
    }
  },
  "description": "Allows J and K to be used to navigate on google search results..",
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.google.com/*"
      ],
      "js": [
        "jk.js"
      ]
    }
  ]
}