cobrowsecobrowse
FAQ:
http://cobrowse.mozdev.org/index.html#FAQ
This version adds Firefox 2.0.0.* support.
This extension turns Firefox into a simple collaborative web browser. With cobrowse installed, one user starts a "server" that will accept incoming connections (currently fixed to port 5000) from folks that have chosen to connect via "client mode".
The server browser then sends every web page navigation change to every client. It even works when changing tabs!
A great alternative to having to say, "okay, see down on the left, under All Extensions... yeah, click Entertainment". Great for showing people around the web.
Coming in the next version:
* Multi-user collaboration using a "push-to-talk" navigation scheme... every user can drive
* Preferences pane so you can select a port