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What version of Firefox am I using, 3 or 4?

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My e-mail recently got hacked and my contacts removed by the hackers. Yahoo is trying to fix the problem. They have asked what version of Firefox I am using. I am not sure, so I'm asking you!

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According to your user agent string you are using Firefox 4.0

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Thank you very much. Now hopefully, I can get the problems I am having with my e-mail resolved!

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Please click the Helpful button next to the answer that solved your Firefox support issue, when you are logged in, so this thread gets marked as Solved.

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what do you mean by "agent string" how do i know which version of Firefox I am using, please? thanks