[morinted]

This looks neat because it allows people to try new features without risking stability in a beta or nightly environment.

It also doesn't hold Mozilla accountable to get these new features into Firefox's core without proving that they are viable and popular.

I'm impressed.

[lmorchard]

FWIW, we're also working to make these things remove themselves cleanly - and if you uninstall the initial Test Pilot add-on, it pulls out all the experimental add-ons along with it and disables any metrics we might have enabled along with it. Bug reports very welcome if this doesn't work as expected