Comment # 6 on bug 1069962 from Michael from Offenbach Germany

I've tested it in the current Firefox 57.0.1 Bugzilla session for this bug:

- clicked on "Add an attachment (proposed patch, testcase, etc.)"

- below "File: Enter the path to the file on your computer (or paste text as
attachment)" is a "Durchsuchen" button (guess "Search for", my OpenSuse/Firefox
is German).

- when clicking "Durchsuchen", a KDE/Dolphin style "Datei hochladen" ("upload
file") dialogue box opens 

- clicking on "Abbrechen" ("cancel") results in the described immediate crash