bgraves, can you please provide a screenshot of the menu you are referring to? Please see How do I create a screenshot of my problem? Once you've done this, attach the saved screenshot file to your forum post by clicking the Browse... button below the Post your reply box. This will help us to visualize the problem.

Is this menu in the Downloads folder that can be seen in "about:downloads"?

You can set the application used in Firefox->Options/Preferences->Applications to select action, or to see if there is a set action that is changing this.

Thank you!

You would normally open the file in a file manager like Nautilus.

• https://wiki.archlinux.org/index.php/Default_Applications

gnome-default-applications-properties
Nautilus: right-click file > Properties > Open with

Thanks for responding, guigs2. I've since blown away the VM and started again, so I don't have a screenshot. The new Firefox installation doesn't have the problem.

Thanks for the link and the tip, cor-el. I'll try Nautilus if I run into the problem again.