Rated 5 out of 5 stars

This is my favorite add-on. Many times a Custom Button can do what an installed Add-On does. A button basically uses your computer's resources (CPU and RAM) when it is clicked as opposed to many installed Add-Ons that take up resources when Firefox loads. This Add-On works fine for me in FF 3.6, FF 4, FF 5, and FF 6.0a2. The Custom Buttons Forum here:
"http://custombuttons.mozdev.org/drupal/forum/1" is the most helpful forum to which I belong. The members
there have consistently reply to my questions very promptly (sometimes within minutes of my posting). They are very willing to share their knowledge of button creation with others. Buttons created by members of that forum can be found here:
"http://custombuttons.mozdev.org/drupal/forum/68"

This review is for a previous version of the add-on (0.0.5.5.1-signed).