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how do I check what version of Firefox I have?

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Player Error ErrorCode: 1001

We could not load the movie player. Please visit our help page for more details.

This is the problem. I downloaded I thought was the latest version of Firefox 2, so I can watch Netflix movies on line but Firefox cannot support Netflix on demand movies? Please help me fix this problem. I was told that this maybe a Silverlight Microsoft issue but I thought that my older version of Firefox was the problem but since Im still recieving the error code from Netflix after Ive downloaded the latest version of Firefox. What can I do?? Please help..

Player Error ErrorCode: 1001 We could not load the movie player. Please visit our help page for more details. This is the problem. I downloaded I thought was the latest version of Firefox 2, so I can watch Netflix movies on line but Firefox cannot support Netflix on demand movies? Please help me fix this problem. I was told that this maybe a Silverlight Microsoft issue but I thought that my older version of Firefox was the problem but since Im still recieving the error code from Netflix after Ive downloaded the latest version of Firefox. What can I do?? Please help..

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Help > About Mozilla Firefox - version information is there