Spybot S&D only immunizing Internet Explorer, which I don't use

Hello, forum members. I'm a longtime user of the free edition. I would have probably bought the full package by now, except for the fact that when I run the Immunization process on my laptop, it only attends to "Internet Explorer", which I have never once used on this computer. I've only ever used Firefox but I can't see a way to make Spybot recognize this. What can I do to make Spybot immunize Firefox instead? Thanks in advance for your help!

Hello. :)
Can you rightclick Spybot, select Run As Administrator, then click Immunization, click Check System. After that on the lower right corner Show Details should appear. Scroll through, does Firefox appear in that window?