Speaking of collaboration, the Peekko Firefox extension allows users to visit a web page and make a chat room out of it.
When the extension is installed, go to a web site and click on the 'P'. At the bottom of the web site, a framed window is displayed and you can start chatting with users who visit that same page.
Using Jybe with Peekko, this can prove to be an excellent team if you allow your client to install both of them. However, since Jybe won't work on newer versions of Firefox, Peekko could be considered an alternative to Jybe instead of working with Jybe.
I found no problems with the extension.