Examine source code of URL Cleaner

{
  "manifest_version": 2,
  "name": "URL Cleaner",
  "version": "2.2",
  "description": "Removes query parameters from URLs in the current window's tabs.",
  "permissions": [
    "tabs",
    "notifications",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.png"
    },
    "default_title": "URL Cleaner",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f379c4bd-46fa-4478-99a7-60840794b0ba}"
    }
  }
}