Under an "about:profiles" profile, selecting the "Open Directory" button opens my Linux "Document Viewer" with an "Unable…" warning; expected because that's not what Document Viewer is for. This could be exactly as predicted in my preferences, but I didn't find any means to redirect that button action at a different helper. I expected it to routinely use my default file manager application and this was a surprise. All I could find searching for the issue focuses on URLs which isn't my problem; I can enter (or copy/paste) the displayed path beside that button okay as "file:///…," so I can call that the workaround. How is this button action set? Is it a simple thing buried somewhere in the settings?