Xchat2 (version 2.8.8)
This add-on is complete with a 99-snap extension to save all of your irc channels, logins, and configuration data.
Also included is 12-inject, a script to inject Xchat2 into your FoxyDesktop.
The 2.8Mb file can be downloaded by <clicking this link>
You will need to rename the extension and remove .noload before restarting for xThunderbird to run.
Xchat will appear in the [TaskBar Menu] --> [Internet]