Examine source code of vi Keys

{
  "manifest_version": 2,
  "name": "vi Keys",
  "version": "0.3resigned1",
  "description": "Scroll pages with vi keys.",
  "permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "vikeys.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0694d30f-a4aa-474f-ae46-f84e530c1cf2}"
    }
  }
}