Hello is an interesting service Mozilla has in Firefox that provides a WebRTC-based alternative to services like Skype. Mozilla has included it in Firefox for some versions but have now decided to drop the Hello addon from the upcoming Firefox 49. Version 49, which is expected to be released in September, will come without support for Hello. Support for the underlying WebRTC technology itself may remain intact.
Mozilla has released a major new version 34 of the Firefox browser, and it comes with a nice WebRTC feature called "Firefox Hello". Using this feature, users can make video and audio calls to other Firefox users without any additional software or plugins. But this feature is not enabled by default so many users couldn't figure out how to use Hello in Firefox 34. Here is how to force Firefox to enable it for you.