Examine source code of Haul

{
  "applications": {
    "gecko": {
      "id": "extension@joinhaul.com"
    }
  },
  "background": {
    "scripts": [
      "public/background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "public/index.html",
    "default_title": "Haul"
  },
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "public/autofill.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start"
    }
  ],
  "description": "Haul does all the work of entering you into competitions and freebies.",
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEArVXSAH9WlAV28JTkFSF620bMk2lSLRiYr4lNOMwWskYSTHOgElGmwYqbzYni43ONm4cWMx373P60bPn+FQqoP8MZW9fkf3SjNrSKsY/QiiUMj5t7nm2BhM0LYwY8Oa0mjjuHEFMGx7gw0FhLyLcbuXlAp3yn38E/AmSb5RrEG8IzqyC7PxASLjHHbhxUtDZM/z410aplR5isSGOW1VugoTNrhjE+ueXwIAHFz+hXAKo53ZKIlUkR4OQT5kqvMqaOjTZz8oWep9/IX7JJVF98UmY/ihWnUVOuusmlDTAws1V9AacgRMpkJHdp8yahRvMks6JEMdCDowoXpyhNz8f9OQIDAQAB",
  "manifest_version": 2,
  "name": "Haul",
  "permissions": [
    "<all_urls>",
    "tabs",
    "activeTab",
    "storage",
    "contextMenus",
    "identity",
    "https://accounts.google.com/*",
    "https://www.facebook.com/*"
  ],
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "7.19.2",
  "web_accessible_resources": [
    "public/*",
    "config.json"
  ],
  "content_security_policy": "script-src 'self' https://www.googletagmanager.com https://www.google-analytics.com 'sha256-DvZkmWSf1Rueyvn030KdWgGgW2OXq5u4JjT9IWdcsI0='; object-src 'self'"
}