I have to use two different versions of Firefox for two different employers - How to install new version without losing old one?

One employer requires that I use Firefox 3. Another requires that I use the newest version. How do I install a new version Firefox to a different path without over-writing the old version?

The easiest way it to have one version be a Firefox Portable installation. The Portable installation is self-contained and won't affect your "regular" Firefox installation.<br />
http://portableapps.com/apps/internet/firefox_portable
Otherwise you need to set up a Profile specifically for the 2nd version and make sure the correct Profile is launched with each version. <br />
[http://support.mozilla.com/en-US/kb/Managing+Profiles] <br />
http://kb.mozillazine.org/Shortcut_to_a_specific_profile
Overall you are probably better off replacing your current Firefox 3.6.25 version with the Portable Apps version - http://portableapps.com/apps/internet/firefox_portable/localization#legacy36 - and install Firefox 9.0.1 as your "regular" installation.

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