Examine source code of deprinfo

{
  "name": "deprinfo",
  "version": "1.1.5resigned1",
  "manifest_version": 2,
  "description": "Detect permissions granted to websites using Facebook and Google to authenticate",
  "background": {
    "scripts": [
      "background_fb.js",
      "background_g.js",
      "hash.js",
      "forcing_user_agent.js"
    ]
  },
  "icons": {
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "https://*.facebook.com/*",
    "https://*.google.com/*",
    "https://depalma.unfiltered.seclab.cs.ucsb.edu/*",
    "webRequest",
    "webRequestBlocking",
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/16_nologo.png",
      "32": "icons/32_nologo.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dc87b84c-2020-4344-be64-7b56b75eb35d}"
    }
  }
}