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How do I create a default file association in Debian with Gnome?

I'm using Debian Jessie 64-bit with Gnome 3.14.1.

My TIF image files are opening by default in the PDF Viewer, don't ask why. In Nautilus, I right-click on the file, click Open With|Other Application...

Select Application window

If I right-click "Image Viewer", there is only "Forget association".

Where is the "create default association" button?