[shrikant]

Where? I have 9.0.570.1 on Windows 7 (32-bit) and I don't see such an option in the about:flags.

The only flag relating to tabs I can see is the first one to put the tabs down the side.

[abraham]

The flag is "Confirm to Quite". It might be Mac (v 9.0.572.1) only right now as I don't see it in Linux (v 9.0.570.1).

[thisisblurry]

I'm 99% certain that this is a Mac-only option for now. It might make it's way into the other OS builds, but I don't think it is currently set up for them.

[shrikant]

Might be a v9.0.572.1 only option, and that version seems to have only made its way to Macs as yet. Windows and Linux seem to be at v9.0.570.1 still.

[zandor]

I've got v9.0.577.0 running on Linux and I don't have it either.