Choosy can prompt you to select from the browsers on your Mac, or just the ones that are running, so you can decide which browser is right for a particular link.
Hunter
I use this all day ever day, in conjunction with Fluid.app to launch almost every webapp I use more than twice a week in its own "app."
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Very useful since I went back to using Firefox and Firefox Developper Edition instead of Chrome with multiple profiles. Rules rule !
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