On Firefox 35, you only need to find the smiley icon on your menu, click it and then start a video or audio conversation. If the other party doesn't have a Firefox account, you can copy and/or email the convo's link that they can click. Easy as pie.
Other than Hello chat, Firefox 35 also comes with an easy way to share links via email and social media in the form of a paper plane icon on the menu. Finally, for those fond of living on the edge (aka beta testers),
Firefox for Marketplace is now in beta for the desktop. It used to be accessible via the browser's Android and Firefox OS versions only, but now its developers need your help testing it out for Windows, Mac and Linux!