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I use Firefox 4 from a flash drive at the public library, but cannot download 5 to the flash drive. How?

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Not haveing my own internet connection I use the machines at the public library, which supply IE. To use Firefox I downloaded and installed Firefox 4 on a flash drive and did so at the library. But now I can not install Firefox 5 the same way.

Not haveing my own internet connection I use the machines at the public library, which supply IE. To use Firefox I downloaded and installed Firefox 4 on a flash drive and did so at the library. But now I can not install Firefox 5 the same way.

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Use Firefox Portable. It is configured for installation on a flash drive.
http://portableapps.com/apps/internet/firefox_portable