Autorenaming? Rated 4 out of 5 stars

Replika wrote: "Very useful, no longer rename manually for duplicated files."

How? I have FF12.0. I have marked "Auto-increment the filename". It should auto-rename duplicate files, am I right? Doesn't work. Suggestions?

This review is for a previous version of the add-on (1.3.6.1-signed).