Docker is real nice, although I might go for pure LXC the nex time I build something. But I'm developing on OSX (as many of us, I believe). So _not_ running a VM is not really possible here. I deploy on Linux, and like to have my environment very consistent, hence the VM. Granted, with Docker/LXC I could probably get by with just one VM and a lot of little apps running side-by-side, but that's not how my current setup and projects work, yet.

At any rate, less memory used by browser is more memory for me, to use any way I want.

I already love the firefox behaviour that when it restores your tabs, it doesn't actually load them until you click on them. Awesome startup speed improvement.

Chromebooks do a great job of this -- inactive tabs are often freed when memory is needed elsewhere, and reloaded as necessary. I wonder if that feature is going to come to Chrome outside of ChromeOS.

For now if you want to run docker on your Mac, the best bet is to use Vagrant + virtualbox (or fusion if you have the provider). This means you have to run another VM to run docker which defeats the purpose of the suggestion of running Docker, so you don't have to run another VM instance.

But then, you can run a single VM with any number of Docker containers inside. Depending on what you are doing, that could be a win.