[Plugin: Collapsing Categories] is the cookie this script install necessary?

This is a little old but anyway I’m going to reply because maybe is useful for someone. When you install this plugin you have a new widget available, collapsing categories widget.

The widget has a lot of configuration options. One of those options under the “Advanced options” reads:
“Remember expanding and collapsing for each visitor (using cookies)”

So it seems self explanatory why a cookie is used and how to disable it if you don’t want that feature.