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Can't even open Firefox, but don't get a crash or anything.

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Whenever I try to open Firefox, whatever the latest version is that's on when I see the download button, I get an error saying to close an existing firefox. THERES NO FUCKING OTHER FIREFOX

This happened

Every time Firefox opened

I used it for the third day.

User Agent

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SU 3.28; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; AskTB5.6)

Whenever I try to open Firefox, whatever the latest version is that's on when I see the download button, I get an error saying to close an existing firefox. THERES NO FUCKING OTHER FIREFOX == This happened == Every time Firefox opened == I used it for the third day. == == User Agent == Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SU 3.28; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; AskTB5.6)

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Please try this solution and please watch your language, this is a family friendly site.