Remove duplicate messages plug-in for Icedove

[Keith Christian <keithchristian@yahoo.com>]

Has anyone figured out how to get this plug-in working for Icedove in 
Debian Etch?

The version of Icedove on my machine is: 1.5.0.14pre.

https://addons.mozilla.org/en-US/thunderbird/addon/956

Thanks in advance for any ideas.

========Keith