Firefox Hello, which we’ve been developing in beta with our partner, Telefonica, is the only in-browser video chat tool that doesn’t require an account or extra software downloads. We recently added screen sharing to Firefox Hello to make it easier to share anything you’re looking at in your video call. Now you can also invite friends to a Firefox Hello video call by sharing a link via the social network or email account of your choice, all without leaving your browser tab. That includes a newly added Yahoo Mail integration in Firefox Share that lets Yahoo Mail users share Hello conversation links or other Web content directly from Firefox Share.
Source : blog.mozilla.org