Examine source code of Domain Resetter

{
  "manifest_version": 2,
  "name": "Domain Resetter",
  "version": "1.1.0",
  "default_locale": "en",
  "description": "__MSG_extension_description__",
  "browser_specific_settings": {
    "gecko": {
      "id": "history@domain-resetter",
      "data_collection_permissions": {
        "required": [
          "browsingActivity",
          "websiteContent",
          "websiteActivity"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "history",
    "browsingData",
    "storage",
    "tabs",
    "notifications"
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "page_action": {
    "default_icon": "icons/icon-128.png",
    "default_title": "Clear history for this domain",
    "show_matches": [
      "<all_urls>"
    ]
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'"
}