MozillaFirefox63。0Beta13（Quantum）发布

　　Mozilla Firefox 63.0 Beta (Quantum) 已经发布，最大的改进来自于对Windows 10的支持上，现在Firefox主题已经可以与Windows 10实现明暗搭配，  并且WebExtensions现在已经可以在Linux上运行。
　　macOS方面的改进就更大一些，WebGL电源首选项允许非性能关键应用程序和applet在多GPU系统中请求低功耗GPU而不是高功率GPU，这有助于省电，并且macOS上的运行效率，尤其是一直被诟病的标签页切换速度也得到了提升。
　　更新列表:
　　New
　　On macOS, WebGL power preferences allow non-performance-critical applications and applets to request the low-power GPU instead of the high-power GPU in multi-GPU systems
　　Improved Windows 10 integration: your Firefox theme now matches your OS Dark / Light mode
　　WebExtensions now run in their own process on Linux
　　Faster tab switching in the majority of cases for our macOS users
　　Improved the reactivity of Firefox on macOS
　　Changed
　　In the Library, the   Open in Sidebar   feature for individual bookmarks was removed
　　Never check for updates  option removed from about:preferences. If a substitute is needed, we recommend using the DisableAppUpdate enterprise policy
　　Firefox now warns about having multiple windows/tabs open when quitting from the main menu.
　　The  Ctrl+Tab  shortcut now displays thumbnail previews of your tabs and cycles through tabs in recently used order. This new default behavior is activated only in new profiles and can be changed in your preferences
　　The build infrastructure of Firefox on Windows moved to the Clang tool chain, bringing important performance gains
　　Developer
　　Changes affecting developers