The collapsible chats were the ONLY reason to use Hangouts. I might as well switch to Skype now.

I have to disagree with the “solid replacement”...

No.

I much preferred Hangouts in the lower right of my browser, accessible from any webpage that I was using.

Not THIS. WTF is this fullpage bullshit?

I uninstalled the entire extension after upgrading; I’ll go back to using the Gmail chat feature before I use this turd again.