Examine source code of Internet Speed Test

{
  "name": "Net Speed Test",
  "manifest_version": 2,
  "version": "0.1.4resigned1",
  "description": "Test your internet connection speed (upload and download) from a toolbar panel",
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>",
    "alarms"
  ],
  "browser_action": {
    "default_popup": "Default.html",
    "default_icon": {
      "16": "Content/Images/16.png",
      "32": "Content/Images/32.png",
      "64": "Content/Images/64.png"
    }
  },
  "icons": {
    "16": "Content/Images/16.png",
    "24": "Content/Images/24.png",
    "32": "Content/Images/32.png",
    "64": "Content/Images/64.png",
    "128": "Content/Images/128.png"
  },
  "background": {
    "persistent": false,
    "scripts": [
      "Script/background.js"
    ]
  },
  "homepage_url": "http://add0n.com/speed-test.html",
  "applications": {
    "gecko": {
      "id": "{a83fddb3-d0c9-42ce-aa5c-a0f9de1312a0}"
    }
  }
}