Examine source code of D3 Lookup

{
  "manifest_version": 2,
  "version": "0.1.6resigned1",
  "name": "D3 Lookup",
  "author": "D3",
  "description": "Find details about a website, like whether or not it is hosted by D3.",
  "homepage_url": "http://d3corp.com",
  "background": {
    "scripts": [
      "hostinfo.js"
    ]
  },
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://ops.d3corp.com/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icon-48.png",
    "default_popup": "frame.html",
    "default_title": "What server is this on?"
  },
  "options_page": "options.html",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bcbe8522-9f4b-4112-aade-91482422e798}"
    }
  }
}