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FIX: Extension icons can no more be clicked when their container is closed.
FIX: The action icons are now hidden after the uninstall icon was clicked.
FEATURE: The PaleMoon and SeaMonkey applications are now supported.
FEATURE: The toolbar button now also gets appended to the ThunderBird application.
FEATURE: The add-on items now scroll with an animation by an integer amount of items.
FIX: Start-up is now more reliable, for example when quickly opening multiple windows.
FIX: Context menu items are now created only when necessary.
FIX: The panel background was made transparent to prevent a paint bug with 100% CPU upon resize.
FIX: The number of rows of blocks is now at least six if needed (rounding correction).
FIX: Again showing round shapes when 'circular' option is selected.
FIX: The outdated extension preferences branch is now removed directly after upgrading (and no more after uninstallation).
FIX: Function.bind is now used instead of closures for callback functions in Core to prevent invalid references.