Examine source code of mozinfo

{
  "manifest_version": 2,
  "name": "Sites",
  "version": "1.1resigned1",
  "permissions": [
    "tabs"
  ],
  "description": "Adds a red border to all webpages matching mozilla.org.",
  "browser_action": {
    "default_icon": "2.jpg",
    "default_title": "Tabs",
    "default_popup": "b.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.mozilla.org/*"
      ],
      "js": [
        "popup3.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3460268d-b7c5-40fa-b460-55f1eaf67ce6}"
    }
  }
}