Getting things going is dead simple. From the Firefox 35 toolbar, just click the cheery Hello icon and start a conversation. Share the link with your family, friends, co-workers, or whoever you need to chat with, and wait for them to click the link. As long as their browser — desktop or mobile — supports WebRTC and can access a camera and mic, they’re good to go.
Once you’ve received a URL for a conversation, it’s there for good. If I want to chat with my parents again in a few days, for example, we can both just click on the same link again. The Hello panel in Firefox maintains a list of all your chat sessions; you can label them so you don’t have to remember which URL corresponds to which contacts and you can delete entries that you no longer need.
Let’s not start calling it a Skype or Facetime “killer” just yet, but Mozilla’s Hello is already a big step forward for cross-platform video calling.