Video (and audio) chat is ubiquitous these days. There's Skype, but you don't need Skype if you're already in your Gmail account (you can start a Google Hangout); if you're on Facebook, you can video chat with your friends with one click; and if you're on an Apple device, FaceTime is just a touch away.
All of those video chat options have two things in common: You must be logged in to use them, and the person you want to talk to has to be using the same app. But there is an option that doesn't need a login nor requires both parties to be on the same app.
Firefox, the Web browser from Mozilla, introduced Hello in last October. Hello is a video and audio chat feature using WebRTC (Real-Time Communications) technology.
WebRTC is an open-source component that any Web browser can use. However not all have it. Google's Chrome browser and the Opera browser use it, as well as Firefox, but Internet Explorer and Apple's Safari do not.
Because Firefox's Hello uses WebRTC technology, if you're using the Firefox browser, you can initiate a video conversation with anyone who has Firefox, Chrome or Opera by simply inviting them to video chat via email or social media.