Examine source code of Focuser

{
  "manifest_version": 2,
  "name": "Focuser",
  "short_name": "Focuser",
  "version": "0.0.1.4resigned1",
  "description": "Set the focus on search boxes without using the mouse",
  "icons": {
    "32": "search32.png",
    "64": "search.png",
    "128": "search128.png"
  },
  "browser_action": {
    "default_icon": "search128.png",
    "default_popup": "popup.html",
    "default_title": "Focus search boxes"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "index.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f9fe8371-beae-4cf6-a1c7-edc9a5a3a98d}"
    }
  }
}