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Rated 1 out of 5 stars
CoLT used to work in Firefox 3, BUT:
Please do not install CoLT because I just found out that it causes "Unexpected Error -203" It INTERFERES with the Extension Manager Modules of Firefox.
I've been forced to reinstall Firefox 3 and rebuild my set of AddOns one by one, and found this is one the culprit addons that causes a critical "Unexpected Error -203"
Error -203 prevents you from installing additional addons in Firefox 3.