Rated 5 out of 5 stars

I am sorry for the comment I made below.

After further research trying to solve "Unexpected Error -203", I found that it's Not this CoLT Extension that has caused it.

To eliminate "Unexpected Error -203", Windows Firewall must be manually configured. Add all Firefox executables in the exclusions list.

This review is for a previous version of the add-on (2.4.1).  This user has other reviews of this add-on.