Examine source code of Tab Focus through Google Results

{
  "manifest_version": 2,
  "name": "Tab Focus through Google Search Results",
  "version": "1.1.1",
  "description": "Use the tab key to navigate through Google search results",
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/search*",
        "*://*.google.ad/search*",
        "*://*.google.ae/search*",
        "*://*.google.com.af/search*",
        "*://*.google.com.ag/search*",
        "*://*.google.com.ai/search*",
        "*://*.google.al/search*",
        "*://*.google.am/search*",
        "*://*.google.co.ao/search*",
        "*://*.google.com.ar/search*",
        "*://*.google.as/search*",
        "*://*.google.at/search*",
        "*://*.google.com.au/search*",
        "*://*.google.az/search*",
        "*://*.google.ba/search*",
        "*://*.google.com.bd/search*",
        "*://*.google.be/search*",
        "*://*.google.bf/search*",
        "*://*.google.bg/search*",
        "*://*.google.com.bh/search*",
        "*://*.google.bi/search*",
        "*://*.google.bj/search*",
        "*://*.google.com.bn/search*",
        "*://*.google.com.bo/search*",
        "*://*.google.com.br/search*",
        "*://*.google.bs/search*",
        "*://*.google.bt/search*",
        "*://*.google.co.bw/search*",
        "*://*.google.by/search*",
        "*://*.google.com.bz/search*",
        "*://*.google.ca/search*",
        "*://*.google.cd/search*",
        "*://*.google.cf/search*",
        "*://*.google.cg/search*",
        "*://*.google.ch/search*",
        "*://*.google.ci/search*",
        "*://*.google.co.ck/search*",
        "*://*.google.cl/search*",
        "*://*.google.cm/search*",
        "*://*.google.cn/search*",
        "*://*.google.com.co/search*",
        "*://*.google.co.cr/search*",
        "*://*.google.com.cu/search*",
        "*://*.google.cv/search*",
        "*://*.google.com.cy/search*",
        "*://*.google.cz/search*",
        "*://*.google.de/search*",
        "*://*.google.dj/search*",
        "*://*.google.dk/search*",
        "*://*.google.dm/search*",
        "*://*.google.com.do/search*",
        "*://*.google.dz/search*",
        "*://*.google.com.ec/search*",
        "*://*.google.ee/search*",
        "*://*.google.com.eg/search*",
        "*://*.google.es/search*",
        "*://*.google.com.et/search*",
        "*://*.google.fi/search*",
        "*://*.google.com.fj/search*",
        "*://*.google.fm/search*",
        "*://*.google.fr/search*",
        "*://*.google.ga/search*",
        "*://*.google.ge/search*",
        "*://*.google.gg/search*",
        "*://*.google.com.gh/search*",
        "*://*.google.com.gi/search*",
        "*://*.google.gl/search*",
        "*://*.google.gm/search*",
        "*://*.google.gr/search*",
        "*://*.google.com.gt/search*",
        "*://*.google.gy/search*",
        "*://*.google.com.hk/search*",
        "*://*.google.hn/search*",
        "*://*.google.hr/search*",
        "*://*.google.ht/search*",
        "*://*.google.hu/search*",
        "*://*.google.co.id/search*",
        "*://*.google.ie/search*",
        "*://*.google.co.il/search*",
        "*://*.google.im/search*",
        "*://*.google.co.in/search*",
        "*://*.google.iq/search*",
        "*://*.google.is/search*",
        "*://*.google.it/search*",
        "*://*.google.je/search*",
        "*://*.google.com.jm/search*",
        "*://*.google.jo/search*",
        "*://*.google.co.jp/search*",
        "*://*.google.co.ke/search*",
        "*://*.google.com.kh/search*",
        "*://*.google.ki/search*",
        "*://*.google.kg/search*",
        "*://*.google.co.kr/search*",
        "*://*.google.com.kw/search*",
        "*://*.google.kz/search*",
        "*://*.google.la/search*",
        "*://*.google.com.lb/search*",
        "*://*.google.li/search*",
        "*://*.google.lk/search*",
        "*://*.google.co.ls/search*",
        "*://*.google.lt/search*",
        "*://*.google.lu/search*",
        "*://*.google.lv/search*",
        "*://*.google.com.ly/search*",
        "*://*.google.co.ma/search*",
        "*://*.google.md/search*",
        "*://*.google.me/search*",
        "*://*.google.mg/search*",
        "*://*.google.mk/search*",
        "*://*.google.ml/search*",
        "*://*.google.com.mm/search*",
        "*://*.google.mn/search*",
        "*://*.google.ms/search*",
        "*://*.google.com.mt/search*",
        "*://*.google.mu/search*",
        "*://*.google.mv/search*",
        "*://*.google.mw/search*",
        "*://*.google.com.mx/search*",
        "*://*.google.com.my/search*",
        "*://*.google.co.mz/search*",
        "*://*.google.com.na/search*",
        "*://*.google.com.ng/search*",
        "*://*.google.com.ni/search*",
        "*://*.google.ne/search*",
        "*://*.google.nl/search*",
        "*://*.google.no/search*",
        "*://*.google.com.np/search*",
        "*://*.google.nr/search*",
        "*://*.google.nu/search*",
        "*://*.google.co.nz/search*",
        "*://*.google.com.om/search*",
        "*://*.google.com.pa/search*",
        "*://*.google.com.pe/search*",
        "*://*.google.com.pg/search*",
        "*://*.google.com.ph/search*",
        "*://*.google.com.pk/search*",
        "*://*.google.pl/search*",
        "*://*.google.pn/search*",
        "*://*.google.com.pr/search*",
        "*://*.google.ps/search*",
        "*://*.google.pt/search*",
        "*://*.google.com.py/search*",
        "*://*.google.com.qa/search*",
        "*://*.google.ro/search*",
        "*://*.google.ru/search*",
        "*://*.google.rw/search*",
        "*://*.google.com.sa/search*",
        "*://*.google.com.sb/search*",
        "*://*.google.sc/search*",
        "*://*.google.se/search*",
        "*://*.google.com.sg/search*",
        "*://*.google.sh/search*",
        "*://*.google.si/search*",
        "*://*.google.sk/search*",
        "*://*.google.com.sl/search*",
        "*://*.google.sn/search*",
        "*://*.google.so/search*",
        "*://*.google.sm/search*",
        "*://*.google.sr/search*",
        "*://*.google.st/search*",
        "*://*.google.com.sv/search*",
        "*://*.google.td/search*",
        "*://*.google.tg/search*",
        "*://*.google.co.th/search*",
        "*://*.google.com.tj/search*",
        "*://*.google.tl/search*",
        "*://*.google.tm/search*",
        "*://*.google.tn/search*",
        "*://*.google.to/search*",
        "*://*.google.com.tr/search*",
        "*://*.google.tt/search*",
        "*://*.google.com.tw/search*",
        "*://*.google.co.tz/search*",
        "*://*.google.com.ua/search*",
        "*://*.google.co.ug/search*",
        "*://*.google.co.uk/search*",
        "*://*.google.com.uy/search*",
        "*://*.google.co.uz/search*",
        "*://*.google.com.vc/search*",
        "*://*.google.co.ve/search*",
        "*://*.google.vg/search*",
        "*://*.google.co.vi/search*",
        "*://*.google.com.vn/search*",
        "*://*.google.vu/search*",
        "*://*.google.ws/search*",
        "*://*.google.rs/search*",
        "*://*.google.co.za/search*",
        "*://*.google.co.zm/search*",
        "*://*.google.co.zw/search*",
        "*://*.google.cat/search*"
      ],
      "js": [
        "google-selectors.js",
        "dom-modifier.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "*://*.duckduckgo.com/*"
      ],
      "js": [
        "ddg-selectors.js",
        "dom-modifier.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "icons": {
    "48": "icon.png",
    "96": "icon@2x.png"
  }
}