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i have the newest firefox but also need older version 3.0

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I have the latest version of Firefox and want to keep it, but I cannot sign up for my bank's online banking with anything newer than 3.0. Where do I find this, and how do I download it without replacing the newest version (I want both on my desktop)?

I have the latest version of Firefox and want to keep it, but I cannot sign up for my bank's online banking with anything newer than 3.0. Where do I find this, and how do I download it without replacing the newest version (I want both on my desktop)?

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Firefox 3.0 hasn't been supported for a couple of years now. Install Firefox Portable 3.6.22 to your hard drive to use at that one website. I won't affect your current Firefox installation.
http://portableapps.com/apps/internet/firefox_portable/localization#legacy36