Rated 5 out of 5 stars

I am using this to toggle toolbars, quickly access menu items, and open web pages.

Some features that could be added: allow users to update or modify web page launchers (going to the English page of Wikipedia automatically for example), having the ability to modify or add buttons, and having button themes or ability to integrate with new themes. These are just nitpick things though.

Thank you for this amazing extension.

This review is for a previous version of the add-on (0.5.0.5). 

The links CAN be configured via about:config (type it in the url bar) they all start with extension.tbutton.url for the link buttons.

If you want to make buttons, maybe you should look into one of the custom buttons extensions, you either have to find the code for the buttons are write your own. Reason they don't tend to be extremely popular. Drag and Drop is much easier for most people.

It would be possible to change the icons quite easily, the only problem is getting enough of them. There are more icons in the extension then most icon sets.