In case there are any Qubes OS users here: we just released Qubes Security Bulletin #29 for a critical Xen bug in PV memory virtualization allowing VM escape (XSA-212):
https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-029-2017.txt
Why would you want this? If you use porcupine as your default browser, you'll never accidentally open links you didn't mean to click.
You also get choice: Which browser should you paste the link in? Your normal browser? An incognito window? Should it go in Tor Browser? If you use Qubes, which AppVM do you want to paste it into?
I also made settings that, so you can run a command instead of copying it to the clipboard. This will open the link in a Qubes DisposableVM