Why doesn't Mountain Lion show Firefox as a running application?

I 'upgraded' from Lion to Mountain Lion at the weekend and am now trouble-shooting some of the many problems it has created.
When Firefox is running it doesn't appear in the application switcher (CMD+Tab) or have a 'blue light' in the Dock - but I can switch to it from the Dock.
Any ideas?
Best,
Keith..

The Dock seems to have a couple of bugs - I've seen it stop updating icons a couple of times, Firefox included.
I fixed it by restarting the dock - if you open Terminal (use Spotlight if you don't know it) and type 'killall Dock' without the quotes, it should fix it.

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