Examine source code of Vim Keyboard Navigator

{
  "manifest_version": 2,
  "name": "Vim Keyboard Navigator",
  "version": "1.0",
  "description": "Navigate web pages using Vim-style keyboard shortcuts.",
  "permissions": [
    "activeTab"
  ],
  "icons": {
    "64": "vimicon64.png",
    "128": "vimicon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_title": "Vim Style Navigator",
    "default_icon": "vimicon64.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{727d27dc-fb7c-427b-8c9c-6d6a8dbcd090}",
      "strict_min_version": "68.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}