I already had two separate "old style" profiles, for personal and work browsing. I just created a new profile (from my "old" personal profile) using the new Profile Manager. I managed to import data from my "old" work profile to the new one. In this process, I ended up creating two new work profiles (with different names). Now, I simply cannot delete one of them. Clicking on the delete icon on the profile manager opens the new profile, and I understood I should see a confirmation dialog corresponding to the "about:deleteprofile" URL, but nothing is shown on this case. Also, this new browser instance doesn't show any profile management menu items. I tried manually removing the profile directory on ~/.mozilla/firefox hoping Firefox would understand it is gone and would automatically get rid of it, but instead it automatically creates a new empty profile on the same directory, and also unmanageable and undeletable. So, if someone could please tell me how I can get rid of this new bogus profile, I'd be very thankful. BTW this whole "new" profiles is a cool idea, but IMHO it was launched in a premature state. They are prettier, indeed, but besides the above annoying bug, there are no CLI args to switch directly to a "new" profile or open the new profile manager. This makes it impossible to use apps like Junction which allows you to choose a browser when you try to open a link (which worked just fine with the "old" profiles)