Very useful Rated 5 out of 5 stars

Actual rating 4.5 stars (for storing data "outside" of Firefox).

May I suggest, instead of having 2 versions--one "regular" and one for Firefox Portable, just have one version with where data is stored being an option (much like other extensions do); or just always store it in the Fx profile folder (or a sub-folder therein, as almost all other extensions do) instead of the user's account folder.

Also, it would be nicer if left-clicking on the toolbar button opened the menu for selecting which clipping to insert (same as context selection) instead of the manager (which you can get to with a right-click).

This review is for a previous version of the add-on (3.2).