Examine source code of Google-Keyboard-nav

{
  "manifest_version": 2,
  "name": "Google-Keyboard-nav",
  "version": "1.2resigned1",
  "description": "Adds keyboard-navigation to google-search-results",
  "icons": {
    "48": "icons/keyboard-navigation-48.png",
    "96": "icons/keyboard-navigation-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://google.ac/search?*",
        "*://*.google.ac/search?*",
        "*://google.ad/search?*",
        "*://*.google.ad/search?*",
        "*://google.ae/search?*",
        "*://*.google.ae/search?*",
        "*://google.af/search?*",
        "*://*.google.af/search?*",
        "*://google.ag/search?*",
        "*://*.google.ag/search?*",
        "*://google.al/search?*",
        "*://*.google.al/search?*",
        "*://google.am/search?*",
        "*://*.google.am/search?*",
        "*://google.as/search?*",
        "*://*.google.as/search?*",
        "*://google.at/search?*",
        "*://*.google.at/search?*",
        "*://google.az/search?*",
        "*://*.google.az/search?*",
        "*://google.ba/search?*",
        "*://*.google.ba/search?*",
        "*://google.be/search?*",
        "*://*.google.be/search?*",
        "*://google.bf/search?*",
        "*://*.google.bf/search?*",
        "*://google.bg/search?*",
        "*://*.google.bg/search?*",
        "*://google.bi/search?*",
        "*://*.google.bi/search?*",
        "*://google.bj/search?*",
        "*://*.google.bj/search?*",
        "*://google.bo/search?*",
        "*://*.google.bo/search?*",
        "*://google.bs/search?*",
        "*://*.google.bs/search?*",
        "*://google.bt/search?*",
        "*://*.google.bt/search?*",
        "*://google.by/search?*",
        "*://*.google.by/search?*",
        "*://google.ca/search?*",
        "*://*.google.ca/search?*",
        "*://google.cat/search?*",
        "*://*.google.cat/search?*",
        "*://google.cc/search?*",
        "*://*.google.cc/search?*",
        "*://google.cd/search?*",
        "*://*.google.cd/search?*",
        "*://google.cf/search?*",
        "*://*.google.cf/search?*",
        "*://google.cg/search?*",
        "*://*.google.cg/search?*",
        "*://google.ch/search?*",
        "*://*.google.ch/search?*",
        "*://google.ci/search?*",
        "*://*.google.ci/search?*",
        "*://google.cl/search?*",
        "*://*.google.cl/search?*",
        "*://google.cm/search?*",
        "*://*.google.cm/search?*",
        "*://google.co/search?*",
        "*://*.google.co/search?*",
        "*://google.com/search?*",
        "*://*.google.com/search?*",
        "*://google.cv/search?*",
        "*://*.google.cv/search?*",
        "*://google.cz/search?*",
        "*://*.google.cz/search?*",
        "*://google.de/search?*",
        "*://*.google.de/search?*",
        "*://google.dj/search?*",
        "*://*.google.dj/search?*",
        "*://google.dk/search?*",
        "*://*.google.dk/search?*",
        "*://google.dm/search?*",
        "*://*.google.dm/search?*",
        "*://google.dz/search?*",
        "*://*.google.dz/search?*",
        "*://google.ec/search?*",
        "*://*.google.ec/search?*",
        "*://google.ee/search?*",
        "*://*.google.ee/search?*",
        "*://google.es/search?*",
        "*://*.google.es/search?*",
        "*://google.eu/search?*",
        "*://*.google.eu/search?*",
        "*://google.fi/search?*",
        "*://*.google.fi/search?*",
        "*://google.fm/search?*",
        "*://*.google.fm/search?*",
        "*://google.fr/search?*",
        "*://*.google.fr/search?*",
        "*://google.frl/search?*",
        "*://*.google.frl/search?*",
        "*://google.ga/search?*",
        "*://*.google.ga/search?*",
        "*://google.ge/search?*",
        "*://*.google.ge/search?*",
        "*://google.gf/search?*",
        "*://*.google.gf/search?*",
        "*://google.gg/search?*",
        "*://*.google.gg/search?*",
        "*://google.gl/search?*",
        "*://*.google.gl/search?*",
        "*://google.gm/search?*",
        "*://*.google.gm/search?*",
        "*://google.gp/search?*",
        "*://*.google.gp/search?*",
        "*://google.gr/search?*",
        "*://*.google.gr/search?*",
        "*://google.gy/search?*",
        "*://*.google.gy/search?*",
        "*://google.hk/search?*",
        "*://*.google.hk/search?*",
        "*://google.gy/search?*",
        "*://*.google.gy/search?*",
        "*://google.hk/search?*",
        "*://*.google.hk/search?*",
        "*://google.hn/search?*",
        "*://*.google.hn/search?*",
        "*://google.hr/search?*",
        "*://*.google.hr/search?*",
        "*://google.ht/search?*",
        "*://*.google.ht/search?*",
        "*://google.hu/search?*",
        "*://*.google.hu/search?*",
        "*://google.ie/search?*",
        "*://*.google.ie/search?*",
        "*://google.im/search?*",
        "*://*.google.im/search?*",
        "*://google.in/search?*",
        "*://*.google.in/search?*",
        "*://google.info/search?*",
        "*://*.google.info/search?*",
        "*://google.iq/search?*",
        "*://*.google.iq/search?*",
        "*://google.is/search?*",
        "*://*.google.is/search?*",
        "*://google.it/search?*",
        "*://*.google.it/search?*",
        "*://google.je/search?*",
        "*://*.google.je/search?*",
        "*://google.jo/search?*",
        "*://*.google.jo/search?*",
        "*://google.jp/search?*",
        "*://*.google.jp/search?*",
        "*://google.kg/search?*",
        "*://*.google.kg/search?*",
        "*://google.ki/search?*",
        "*://*.google.ki/search?*",
        "*://google.kz/search?*",
        "*://*.google.kz/search?*",
        "*://google.la/search?*",
        "*://*.google.la/search?*",
        "*://google.li/search?*",
        "*://*.google.li/search?*",
        "*://google.lk/search?*",
        "*://*.google.lk/search?*",
        "*://google.lt/search?*",
        "*://*.google.lt/search?*",
        "*://google.lu/search?*",
        "*://*.google.lu/search?*",
        "*://google.lv/search?*",
        "*://*.google.lv/search?*",
        "*://google.ma/search?*",
        "*://*.google.ma/search?*",
        "*://google.md/search?*",
        "*://*.google.md/search?*",
        "*://google.me/search?*",
        "*://*.google.me/search?*",
        "*://google.mg/search?*",
        "*://*.google.mg/search?*",
        "*://google.mk/search?*",
        "*://*.google.mk/search?*",
        "*://google.ml/search?*",
        "*://*.google.ml/search?*",
        "*://google.mn/search?*",
        "*://*.google.mn/search?*",
        "*://google.ms/search?*",
        "*://*.google.ms/search?*",
        "*://google.mu/search?*",
        "*://*.google.mu/search?*",
        "*://google.mv/search?*",
        "*://*.google.mv/search?*",
        "*://google.mw/search?*",
        "*://*.google.mw/search?*",
        "*://google.mx/search?*",
        "*://*.google.mx/search?*",
        "*://google.ne/search?*",
        "*://*.google.ne/search?*",
        "*://google.net/search?*",
        "*://*.google.net/search?*",
        "*://google.ng/search?*",
        "*://*.google.ng/search?*",
        "*://google.nl/search?*",
        "*://*.google.nl/search?*",
        "*://google.no/search?*",
        "*://*.google.no/search?*",
        "*://google.nr/search?*",
        "*://*.google.nr/search?*",
        "*://google.nr/search?*",
        "*://*.google.nr/search?*",
        "*://google.nu/search?*",
        "*://*.google.nu/search?*",
        "*://google.pf/search?*",
        "*://*.google.pf/search?*",
        "*://google.pk/search?*",
        "*://*.google.pk/search?*",
        "*://google.pl/search?*",
        "*://*.google.pl/search?*",
        "*://google.pn/search?*",
        "*://*.google.pn/search?*",
        "*://google.ps/search?*",
        "*://*.google.ps/search?*",
        "*://google.pt/search?*",
        "*://*.google.pt/search?*",
        "*://google.qa/search?*",
        "*://*.google.qa/search?*",
        "*://google.re/search?*",
        "*://*.google.re/search?*",
        "*://google.ro/search?*",
        "*://*.google.ro/search?*",
        "*://google.rs/search?*",
        "*://*.google.rs/search?*",
        "*://google.ru/search?*",
        "*://*.google.ru/search?*",
        "*://google.rw/search?*",
        "*://*.google.rw/search?*",
        "*://google.ru/search?*",
        "*://*.google.ru/search?*",
        "*://google.rw/search?*",
        "*://*.google.rw/search?*",
        "*://google.sc/search?*",
        "*://*.google.sc/search?*",
        "*://google.se/search?*",
        "*://*.google.se/search?*",
        "*://google.sh/search?*",
        "*://*.google.sh/search?*",
        "*://google.si/search?*",
        "*://*.google.si/search?*",
        "*://google.sk/search?*",
        "*://*.google.sk/search?*",
        "*://google.sl/search?*",
        "*://*.google.sl/search?*",
        "*://google.sm/search?*",
        "*://*.google.sm/search?*",
        "*://google.sn/search?*",
        "*://*.google.sn/search?*",
        "*://google.so/search?*",
        "*://*.google.so/search?*",
        "*://google.sr/search?*",
        "*://*.google.sr/search?*",
        "*://google.st/search?*",
        "*://*.google.st/search?*",
        "*://google.td/search?*",
        "*://*.google.td/search?*",
        "*://google.tg/search?*",
        "*://*.google.tg/search?*",
        "*://google.tk/search?*",
        "*://*.google.tk/search?*",
        "*://google.tl/search?*",
        "*://*.google.tl/search?*",
        "*://google.tm/search?*",
        "*://*.google.tm/search?*",
        "*://google.tn/search?*",
        "*://*.google.tn/search?*",
        "*://google.to/search?*",
        "*://*.google.to/search?*",
        "*://google.tt/search?*",
        "*://*.google.tt/search?*",
        "*://google.ua/search?*",
        "*://*.google.ua/search?*",
        "*://google.us/search?*",
        "*://*.google.us/search?*",
        "*://google.uz/search?*",
        "*://*.google.uz/search?*",
        "*://google.vg/search?*",
        "*://*.google.vg/search?*",
        "*://google.vn/search?*",
        "*://*.google.vn/search?*",
        "*://google.vu/search?*",
        "*://*.google.vu/search?*",
        "*://google.ws/search?*",
        "*://*.google.ws/search?*"
      ],
      "js": [
        "keyboard-navigation.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2732c756-9b9b-49c0-8275-4d3e17836114}"
    }
  }
}