Mozilla Firefox 63.0 Beta (Quantum) has been released, and the biggest improvement comes from support for Windows 10. Firefox themes can now be lighted and shaded with Windows 10 implementations, and Web Extensions can now run on Linux.
MacOS improvements are even greater, with WebGL power preferences allowing non-performance-critical applications and applets to request low-power GPUs instead of high-power GPUs on multi-GPU systems, which helps save power and improves the efficiency of running on macOS, especially the ever-criticized tab switching speed.
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 / OS
WebExtensions now run in their own process on Linux
Faster tab switching in the majority of cases for our macOS our
Improved the reactivity of Firefox on macOS
In the Library, the Open in Sidebar feature for individual bookmarks individual
Never check for updates option removed from about: preferences. If a substitute is needed, we recommend using theDisableAppUpdateEnterprise policy
Firefox now warns about having multiple windows/tabs open when quitting from quitting
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