Not exactly sure why this is here, but for context, Firefox 54 shipped this week, and 55 was promoted to Beta.<p>As part of our effort to eliminate the pre-beta ("aurora") channel, 55 spent twice as long in development: instead of promoting to "aurora" six weeks ago, it stayed in nightly until this week, where it moved directly to beta. Future releases will continue this nightly -> beta -> release cadence.<p>A few of the changes in 55:<p>- startup and session restoration are dramatically faster, as we can now defer almost all of the work related to restoring unloaded tabs.<p>- SharedArrayBuffer is also getting turned on by default, and my teammate Lin Clark just wrote an excellent three-part article on it at <a href="https://hacks.mozilla.org/2017/06/a-crash-course-in-memory-management/" rel="nofollow">https://hacks.mozilla.org/2017/06/a-crash-course-in-memory-m...</a><p>- Object destructuring / spread, async generators, and requestIdleCallback are all in.<p>- WebVR 1.1 is enabled on Windows, with other platforms working in Nightly<p>- Flash is moving to click-to-activate<p>- WebExtensions will be able to configure proxy settings<p>...And a whole bunch of miscellaneous performance improvements, features, and the further rollout of multiple content processes in stable Firefox.<p>All of this is leading up to Firefox 57, which will be a major release in November that marks the deprecation of legacy add-on APIs in favor of cross-browser "WebExtensions", an overhauled UI ("Photon"), and the integration of many components from the Servo Parallel Browser Project ("Quantum").