Fixed

• Fixed missing content on Blackboard course listings (bug 1665447)

• Resolved incorrect scaling of Flash content on HiDPI macOS systems (bug 1667267)

• Fixes for various printing issues (bug 1667342, bug 1667510, bug 1667723)

• Fixed legacy preferences not being properly applied when set via GPO (bug 1666836)

• Fixed Picture-in-Picture controls being visible on audio-only page elements (bug 1666775)

• Fixed high memory growth with addons such as Disconnect installed, causing browser responsiveness issues over time (bug 1658571)

• Various stability improvements (bug 1661485, bug 1664542, bug 1664843)

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Available via the internal updater:   Help / About Firefox