[mtreis86]

Qubes is a Linux OS. It's like if you took Fedora and installed xen on it and booted up some VMs and the windows for them opened within the base OS instead of in individual system windows. Plus some cool magic with the file system to reduce redundancy and how many times you have to update things.

[accassar]

And cooler magic to colour code your window borders. Effectively gives you a VM running Firefox and you only see the Firefox window.

This will let you run your email in one window, and click on a link to open it in another VM.