Does not work (sending or receiving) in firefox, which is a damn shame. Works rather well in Chromium, as expected.

What version are you using? We'll look into it and get it fixed asap.

Same here, doesn't work on FF 30, on Ubuntu. Two machines behind the same NAT router. They connect but the files never get transferred.

Firefox issues have been fixed, give it another try!

very strange. it works fine on Firefox Android (Fennec), but refuses to work on desktop Firefox or Chromium in Arch Linux. I can get to the "Enter Your Name" box, but it never goes past.

Before, chromium worked. now neither browser does in Arch Linux.

stock firefox in Arch linux current, on two separate machines. both worked fine in chromium.

Does not work on Chrome, not sure if proxy related to work or not.

Chrome version 41.0.2272.89 m

Yea, we did see issues with a small number of users behind a symmetric nat, which is usually found at work. We're looking into ways around this and we're open to suggestions :)

However, you may still be able to send files back and forth if both users are inside the firewall.

I tried that, but I cannot even enter my username. After entry, it won't permit me to click on the 'Continue' button. It does not seem to be active.

WebRTC?

Yep.