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I just uploaded version 6. How do i return to version 5?

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I have various secure sites I use for work. After upgrading to Firefox 6, some of these sites say they do not support version 6, only version 5 or earlier. I need to return to version 5. If I do an uninstall and then re-install, I have a hunch I will be re-installing 6.

Thank You, Rolf

I have various secure sites I use for work. After upgrading to Firefox 6, some of these sites say they do not support version 6, only version 5 or earlier. I need to return to version 5. If I do an uninstall and then re-install, I have a hunch I will be re-installing 6. Thank You, Rolf

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Mozilla Firefox, Portable Edition

Install Firefox Portable 3.6.20 to use at those web site. It won't affect your current version of Firefox at all.

Check and tell if its working.