Rated 5 out of 5 stars

Here is a modified version, which works fine with FF 3.0.1:
http://rapidshare.com/files/130742319/auto_copy-0.8-fx-FF3.0.1-mod.xpi.html

Just download, and drag to a Firefow window, then press install.

This review is for a previous version of the add-on (0.9.1).