v5.6.0

Added

• Tabs: Configurable badges (for notifications and other info) (co-authored with @cnnrro: #2262)

Fixed

• Tabs: Suboptimal "tabs reload limit" logic and pending-mark styles
• History: Redundant and potentially harmful setting "Load history on demand"
  Always load the history service on demand. Previously, if this setting
  was disabled, the history service might never unload, handling all
  visits and title change events and wasting CPU time.
• History: Incorrect updating of titles
• Snapshots: Group/placeholder URLs are not migrated to a new profile
• Renamed container colors are not handled properly
  • Add 'cyan' alias for 'turquoise' and 'gray' for 'toolbar'
  • Keep old color names for snapshots and bookmarks (temporary)
• Tab preview:
  • Removed the window-mode as it doesn't work correctly anyway.
  • Changed "in-sidebar" mode from inline to popup-like preview.

Localization

• Update French translation (by @ariasuni: #2396)

Performance Improvements

• History: Improved handling of title change events
  Optimizes performance when a large number of tabs frequently change their titles. Configurable via hidden historyTitleUpdInterval pref (ms, 0 - off, small values might cause performance issues).
• Inactive panels are no longer rendered
  Note: Due to https://bugzilla.mozilla.org/show_bug.cgi?id=1882408, the disappearing (leave) part of animation on panel switch will not work.

Contributions

• @cnnrro: #2262
• @ariasuni: #2396

Full Changelog

v5.5.2...v5.6.0