Its integrated into gmail, even in Firefox, with the gtalk plugin. I use KTP for the hangouts chat part, and then my gmail tab rings when people call me on it.

Its integrated into gmail, even in Firefox, with the gtalk plugin. I use KTP for the hangouts chat part, and then my gmail tab rings when people call me on it. Its suboptimal, and a huge usability loss from 5 years ago when Google wasn't pushing proprietary bullshit but instead had jingle, but it at least barely works still.