Examine source code of HTML To JSON

{
  "name": "HTML to JSON",
  "version": "0.2.1",
  "description": "Convert HTML to JSON",
  "manifest_version": 2,
  "icons": {
    "16": "addonpackage/images/h2j.png",
    "32": "addonpackage/images/h2j.png",
    "48": "addonpackage/images/h2j.png",
    "128": "addonpackage/images/h2j.png"
  },
  "browser_action": {
    "default_popup": "addonpopup.html",
    "browser_style": true
  },
  "permissions": [
    "scripting",
    "activeTab",
    "tabs",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "addonpackage/js/stringMatchingAPI.js"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>",
        "*://*/*"
      ],
      "js": [
        "addonpackage/js/contentscript.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "addonpackage/js/background.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{12db2521-c4d5-4f0b-96fd-1c16e8a138c3}"
    }
  }
}