This really is a nice trick I've never heard before. Someone just showed it to me and I had to share it with you.
One can run multiple instances of Firefox, Thunderbird and most moz products, the secret is to set the MOZ_NO_REMOTE to 1 before launching your instances of mozilla products. This means you can browse using a stable product, while test and play with the latest beta. You need to use a different profile so things don't get messed up. Isn't this feature cool ?
Is there a way to tell Camino to use a specific profile ?
MOZ_NO_REMOTE=1
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With Firefox 2 (Gecko 1.8.1), you no longer need to set MOZ_NO_REMOTE=1. Bug 325509 introduced a -no-remote switch with the same effect:
firefox.exe -no-remote [-P profilename]
http://pimpmycamino.com/parts/portable-camino runs a profile within the application
CAMINO_PROFILE_DIR. It's not on the branch for 1.0.x builds yet, though, so it only works with recent 1.8 branch or trunk builds.