All Downloads Complete! notification window stuck on 2nd monitor; requires Firefox restart to remove

[LacrociviousAcrophosist]

Your DownThemAll! and Browser Version and Language and Operating System

DownThemAll! 3.0.8
Firefox 52.0 (64-bit)
English
Linux piriguete.cos.lan 4.1.13-100.fc21.x86_64 #1 SMP Tue Nov 10 13:13:20 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
KDE Desktop Environment: kde-runtime-15.08.1-1.fc21.x86_64

Expected Behavior

'All Downloads Complete!' notification window disappears after window timeout, as do queue notification etc. notification windows

Actual Behavior

'All Downloads Complete!' notification window remains stuck in upper left corner of 2nd monitor. Other notification windows appear in upper right of second monitor and disappear after window timeout. It would be better if all notifications appear instead on primary monitor, but meh.

Steps To Reproduce

Download a file or files. 'All Downloads Complete!' notification window appears in upper left corner of 2nd monitor and remains there. Closing DTA manager window does not make the notification window disappear. Subsequent downloads do not make it disappear. Only a Firefox exit/reload removes the notification window.

Additional info such as log extracts

..# lspci | grep -i vga
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde XT [Radeon HD 7770/8760 / R7 250X]

Diagnostic logging presently disabled, but will be enabled and logs provided after enabling at request of anyone who needs them to fix this bug. Note that I am not even suggesting this is, at root, a DTA bug.

Please enable Diagnostic Logging in the Privacy tab of the DownThemAll! preferences and either copy/paste essential part of the log or attach the entire log. Please note that the log may include sentitive information which you have to remove prior to posting it!

[LacrociviousAcrophosist]

Log from launching a new Firefox session, selecting 'Save link with DownThemAll!', then closing DTA.

dta-edited-for-privacy-log.txt