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Firefox stays on top when I open a new desktop on my Mac. How do I disable it?

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I am using a Mac Book Pro OSX 10.7.5 I have multiple desktop options. Before I would be able to have firefox open in one desktop and have other applications even other browsers open in other desktops. I was able to scroll between them at leisure. Now for some unknown reason firefox stays on top of every desktop when I switch to it. Even if I open a new desktop firefox moves to that one. I want this to stop happening.

I am using a Mac Book Pro OSX 10.7.5 I have multiple desktop options. Before I would be able to have firefox open in one desktop and have other applications even other browsers open in other desktops. I was able to scroll between them at leisure. Now for some unknown reason firefox stays on top of every desktop when I switch to it. Even if I open a new desktop firefox moves to that one. I want this to stop happening.

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Did you installed any firefox addon to run in it background. or check firefox in start up application?

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No. No add ons, or start up options that I know of.