Examine source code of vimStyleScroll

{
  "manifest_version": 2,
  "name": "vimScroll",
  "version": "1.0",
  "description": "Enables users to scroll using hjkl keys, similar to vim.",
  "icons": {
    "48": "icons/height_48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "scroll.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1234d4ad-e8c1-4d57-8111-53f2ca4a938e}"
    }
  }
}