Bobby, I'm pretty sure that multiple instances of all applications show up as separate entries on the Applications tab of task manager.
I tried to recreate what you're seeing and there is only one instance of FF on the Processes tab. Although I did not install FF maintenance service, so that might be why there is a difference.
I do have one app, Text Pad, that is configured to run in it's own space - that does show an Applications tab and Processes tab instance for each TextPad window.
Try launching three or four new FF windows (not tabs) - are you seeing an entry on the Processes tab for each window? If not, I suspect that it is the FF maintenance service.