Access common preferences from a menu button. It includes settings for page download and display, tabs, proxy, spoofing user agent (user agent switching), enable or disable the Adblock extension and more. Click on More Previews>> under the... Firefox 専用 — 今すぐ Firefox をダウンロード
![Quick Preference Button :: Firefox Add-ons](https://cdn-ak-scissors.b.st-hatena.com/image/square/e1383735933af9b8ce3d005eac4804994cdf5b9a/height=288;version=1;width=512/https%3A%2F%2Faddons.cdn.mozilla.net%2Fuser-media%2Fpreviews%2Ffull%2F4%2F4238.png%3Fmodified%3D1530207964)