Examine source code of PageSpeed Insights

{
  "browser_action": {
    "browser_style": true,
    "default_icon": "images/pagespeed-19.png",
    "default_popup": "psi.html",
    "default_title": "PageSpeed Insights"
  },
  "description": "PageSpeed Insights",
  "icons": {
    "16": "images/pagespeed-16.png",
    "32": "images/pagespeed-32.png",
    "48": "images/pagespeed-48.png",
    "64": "images/pagespeed-64.png",
    "128": "images/pagespeed-128.png"
  },
  "manifest_version": 2,
  "name": "PageSpeed Insights",
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "version": "0.1.0.1resigned1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{f9263e7a-8e0a-4017-a394-dc1ae3b1252d}"
    }
  }
}