Examine source code of Neat URL

{
  "name": "Neat URL",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "http://itsafeature.org",
  "manifest_version": 2,
  "version": "5.0.0",
  "default_locale": "en",
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "background.js",
      "toolbaricon.js"
    ]
  },
  "icons": {
    "48": "icons/dark/neaturl-48.png",
    "96": "icons/dark/neaturl-96-state0.png"
  },
  "applications": {
    "gecko": {
      "id": "neaturl@hugsmile.eu",
      "strict_min_version": "48.0"
    }
  },
  "permissions": [
    "storage",
    "notifications",
    "contextMenus",
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "<all_urls>"
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "browser_action": {
    "default_icon": "icons/dark/neaturl-96-state0.png",
    "browser_style": true
  }
}