Examine source code of browserquery

{
  "manifest_version": 2,
  "name": "browserquery",
  "description": "Query your current browser state (experimental)",
  "version": "0.1.2",
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "96": "icon-96.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "tabs"
  ],
  "commands": {
    "open-popup": {
      "suggested_key": {
        "default": "Alt+Shift+Space"
      },
      "description": "Open the popup window"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "browserquery",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9131ad08-5671-4189-bd48-41db80cc1f83}"
    }
  }
}