Rated 4 out of 5 stars

I really like this extension as it allows you to streamline multiple extensions into a single file.

My only gripe is that there is no 'select all' function. If you have 20+ extensions, you should be able to select all, instead of manually shift clicking each one.

Apart from that, I think this extension makes a great companion for FEBE! :).

This review is for a previous version of the add-on (3.3.1). 

Multiple selection of items

There are a few ways to select several items at once. Shift-click the first and the last to select a range, Ctrl-click to select/deselect a singe item, or Ctrl-A to select everything. Note that these commands are not special to CLEO, they apply to any window where selection is allowed (at least in Windows, don't know about *nix or Mac)