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How do I make sure your dowload is coming from a ligitmate website?

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I'm ready to download Firefox from the mozilla.eu-US website but the warning at the start of the download says 'mirror.informatic.uni-mannheim.de' is this website ligitimate? I do want the English/US version. I did make an attempt to use your self help forum and got stumped on 'must enter post subject' prompt. I didn't know what, or where to enter that, sorry.

This happened

Just once or twice

i tried to install

User Agent

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; MDDC; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

I'm ready to download Firefox from the mozilla.eu-US website but the warning at the start of the download says 'mirror.informatic.uni-mannheim.de' is this website ligitimate? I do want the English/US version. I did make an attempt to use your self help forum and got stumped on 'must enter post subject' prompt. I didn't know what, or where to enter that, sorry. == This happened == Just once or twice == i tried to install == == User Agent == Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; MDDC; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

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Mozilla uses mirrors all around the world to spread the server load.

See the list here: http://www.mozilla.org/mirrors.html