On Tuesday November 28th from 9:00AM PT - 12PM PT (5:00PM UTC - 8PM UTC), we will be performing system maintenance on support.mozilla.org. During the maintenance period, users will not be able to sign in to the website, and all users signed in at the start of the maintenance period will be signed out.

为提升您的使用体验，本站正在维护，部分功能暂时无法使用。如果本站文章无法解决您的问题，您想要向社区提问的话，请到 Twitter 上的 @FirefoxSupport 或 Reddit 上的 /r/firefox 提问，我们的支持社区将会很快回复您的疑问。