For anyone who doesn't know this already, running the nightly builds of Firefox is ridiculously easy. Just visit this page.
On OS X, I have the stable Firefox.app and bleeding edge Nightly.app installed side-by-side, and never have any problems.
On OS X, I have the stable Firefox.app and bleeding edge Nightly.app installed side-by-side, and never have any problems.
I use Nightly and don't have this feature.