Superb! Rated 5 out of 5 stars

Works more than perfectly with FF 3.0.1.

A single button:
- click on the icon and it prints;
- click on the little arrow on the right side of the button, and a menu lets you select between Print/Print-Preview/Page format commands

- a context menu item (right-click the mouse button on a web page) displays a Print sub-menu offering the same choices.

This review is for a previous version of the add-on (0.6).