Mozilla Firefox 61.0 Beta 已发布，主要带来了 Quantum 引擎性能上的改进，优化了处理 CSS 的过程，让页面加载速度更快，并且用户还会感觉到切换标签页也会变快。
同时 Firefox 61.0 Beta 还提供了对暗色主题的支持。有兴趣的朋友可以登录 Mozilla FTP 下载到这一版本。
下载地址：
https://ftp.mozilla.org/pub/firefox/releases/61.0b13/
New
Performance Enhancements:
Quantum CSS improvements which improve page rendering times
Improved page rendering speed with the new retained display list feature
Faster switching between tabs on Windows and Linux
WebExtensions now run in their own process on MacOS
Various improvements for dark theme support will provide a more consistent experience across the entire Firefox UI
Added the ability to share current the URL with MacOS sharing providers from the Page Actions menu
OpenSearch plugins offered by web pages can now be added from the page action menu for easier installation
Improved support for allowing WebExtensions to manage and hide tabs
Changed
The settings for customizing your homepage and new tab page in Firefox have been moved to a new Preferences section, Home. It can be accessed from the sidebar in Preferences or by visiting about:preferences#home
In order to improve user security, access to FTP subresources inside http(s) pages has been blocked
Developer
A new drop down menu was added to the Developer Tools Network panel to allow bandwidth throttling, rather than requiring users to do so via Responsive Design Mode
