Firefox is a fast and open source browser, which means users can customize their browsing experience in every way possible. Firefox also allows the casual user several different ways to customize the UI with applying different themes and toolbar configurations. Since our browser has always been open source we have a large following of devoted developers who have created an extensive library of add-ons and browser extensions.
Firefox 是一款快速的开源浏览器，这意味着用户可以通过各种方式定制他们的浏览体验。Firefox 还允许用户通过应用不同的主题和工具栏配置来定制 UI。我们的浏览器一直都是开源的，在众多忠实开发者的共同努力下，我们建立了一套丰富多彩的附加组件和浏览器扩展库。