On any window in Gnome you can right-click and select "Task-Manager".
That window is a GUI overview of active processes.
It will start with the window you clicked on pre-selected.
And among other things you will find the process-id of that process there.
That allows you to check via ps axlf or in /proc//... or any other means to find what program it actually is. From there you hopefully can find what started/opened it.
On any window in Gnome you can right-click and select "Task-Manager". That window is a GUI overview of active processes.
It will start with the window you clicked on pre-selected. And among other things you will find the process-id of that process there.
That allows you to check via
ps axlf
or in /proc//... or any other means to find what program it actually is. From there you hopefully can find what started/opened it.