[wpietri]

Using Firefox 24, I just went to hangouts.google.com and clicked the "Available for your computer" button. "Hangouts won't work in your current browser. You'll need to download Chrome before installing Hangouts."

And a week or so ago somebody invited to a call was told he couldn't join in the version of Firefox he was using, which I'm pretty sure was up to date.

I avoid using it in Firefox; on Linux, it was performing terribly in FF but fine in Chrome.