Examine source code of Simple Vim Scrolling

{
  "manifest_version": 2,
  "name": "Vim-Style Page Navigation",
  "version": "1.0",
  "description": "Navigate pages using vim-style keyboard shortcuts (j/k for scrolling, gg/G for top/bottom, / for link hints)",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "page-navigator.js"
      ]
    }
  ],
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{850d6539-fd9f-496d-aaaf-48e5bebf617a}"
    }
  }
}