For a while, the drag+drop operation from the little mail icon on the Current Folder (Navigation) Toolbar has been broken. The icon (representing the currently highlighted emails) could not be dragged anymore.

Apparently this was caused by an unnoticed change in the function
messenger.messageServiceFromURI()
The old function GetUrlForUri() has been replaced with a newer version getUrlForUri() which operates with different parameters.
For a while, the drag+drop operation from the little mail icon on the Current Folder (Navigation) Toolbar has been broken. The icon (representing the currently highlighted emails) could not be dragged anymore.
Apparently this was caused by an unnoticed change in the function
messenger.messageServiceFromURI()The old function
GetUrlForUri()has been replaced with a newer versiongetUrlForUri()which operates with different parameters.