Firefox profiles are a hard thing to discover. When you start Developer Edition Firefox up by default it starts in its own profile. I'd guess Nightly does the

Firefox profiles are a hard thing to discover. When you start Developer Edition Firefox up by default it starts in its own profile. I'd guess Nightly does the same too. Regardless, it'd be nice of Mozilla to make profiles more accessible through the default UI. I've set up my FF to start with the profile selector every time I start it up, but in firefox in order to switch profiles one has to go to about:profiles.