Why do I have 2 versions 15.0.0 and 15.0.1 of FireFox in my control Panel Window Vista x86?

I noticed that I have 2 different versions of Firefox 15.0.0 and 15.0.1 in my Control Panel in Window Vista. Before I do anything, I need to know why do I have 2 Firefox in my system and how did it happened. Is it safe for me to uninstall the old versions? If so, how? I am a beginner, not expert on computer.

Thank you, Sue

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