3.8.23

Introduce a workaround of problems around wrong coordinates of `dragend` events on Firefox 99 and later (the [bug 1767165](https://bugzilla.mozilla.org/show_bug.cgi?id=1767165)). It reduces unexpected detaching of tabs especially on a rightside placed sidebar. This workaround can be disabled by unchecking `enableWorkaroundForBug1767165_fixDragEndCoordinates` via TST Options - "Development" - "All Configs".