Examine source code of KeyboardNav

{
  "manifest_version": 2,
  "name": "KeyboardNav",
  "version": "1.0",
  "description": "Provides customizable keyboard shortcuts for navigating web pages",
  "author": "ReimarPB",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "options_ui": {
    "page": "settings/settings.html",
    "browser_style": true
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "permissions": [
    "<all_urls>",
    "storage"
  ]
}