FIX: The panel again uses native scrolling in order to restore touch device compatibility.

FEATURE: A contrast color is now used in the panel to distinguish all clickable elements.
FEATURE: The PaleMoon and SeaMonkey applications are now supported.
FEATURE: The toolbar button now also gets appended to the ThunderBird application.
FIX: The panel content scroll buttons are now always displayed when sizing down by making use of the resize event.

FEATURE: The panel is now sizable and the panel content accessibility was improved for touch screens.
FEATURE: The panel is now non-auto-hiding by default and is less opaque when the containing window is inactive.
FIX: The user pref "layout.css.devPixelsPerPx" leads to inconsistent scaling and is therefore reset to "-1.0".
FIX: Wrong compensation at the chrome side of non-standard screen resolutions was removed.
FIX: The canvas is now restored to the open options panel when a context menu is closed.
FIX: Quickly opening many Firefox windows no more leads to initialization failure.
FIX: The panel now clips the canvas control when it is larger than the container.
FIX: The extension links in the panel footer now also work in Thunderbird.

FEATURE: An item for opening the options panel is now optionally added to several context menu's.
FEATURE: Support for Thunderbird was restored, although not all functionality is available.
FIX: Context menu items are now created only when menu's are shown (this also prevents the failure of XUL overlays).
FIX: Start-up is now more reliable, for example when quickly opening multiple windows.
FIX: A mistake in a condition testing for the number of windows during start-up was fixed.
FIX: Target positions are now stored on windows rather than globally to prevent conflicts, e.g. during start up.
FIX: The panel background was made transparent to prevent a paint bug with 100% CPU upon resizing off-screen.
FIX: A pinned panel is now prevented from moving after the window position changes.
FIX: The "exit" message is now sent to all remote content frames and not only to all tabs.
FIX: The outdated extension preferences branch is now removed directly after upgrading (and no more after uninstallation).