Unable to change the account. I want to always use mail.google.com/chat/u/1/

It opens a pop-up that stays ontop and CANNOT be minimized, so you have to close it every time: and every time you open it, il reload all the page. Finally it's better to open hangouts in a tab of the browser and switch on it when needed!

poors notifications: I want a little popUp, no a red ballon