Examine source code of comfortableNavigation

{
  "manifest_version": 2,
  "author": "ianuj03",
  "name": "Navigation",
  "version": "1.3resigned1",
  "description": "Vim Navigation",
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "all_frames": true,
      "js": [
        "navigation.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{157ec8c7-f083-4cad-9e5e-8a802420f1ba}"
    }
  }
}