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Work software only supports Firefox 1 and 2, not 3.5. How do I run earlier format?

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I work for a hospital that uses a scheduling system that we can access from home called "Clarvia" or Care Value System. When I try to login on my computer it tells me that I am using an unsupported system format and states that it only supports Firefox 1 and 2. I am currently using 3.5 and when I try to bypass this screen, I get stuck in a continual loop when it asks for my security information. Is there a way to bypass this or run an earlier format when needed?

I work for a hospital that uses a scheduling system that we can access from home called "Clarvia" or Care Value System. When I try to login on my computer it tells me that I am using an unsupported system format and states that it only supports Firefox 1 and 2. I am currently using 3.5 and when I try to bypass this screen, I get stuck in a continual loop when it asks for my security information. Is there a way to bypass this or run an earlier format when needed?

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Firefox 3.5.3 is very out-of-date, from late August 2009 - Firefox 3.5.15 was just released, so you need to update it.

Unlike Windows and Linux, I don't think you can have two different versions of Firefox installed on MacOSX at the same time. My advice is to use Portable Firefox on a USB stick for accessing that scheduling system.

http://sourceforge.net/projects/osxportableapps/files/Portable%20Firefox%20OS%20X
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