generates encoded signatures to add to update.rdf and install.rdf in secure firefox 3 toolbars

Mozilla's main page for this sort of thing

mozilla's how-to documentation for mccoy

The Custom Buttons² Firefox extension provides the code base support necessary to create, maintain, import, and export custom toolbar buttons. These custom buttons can be written to do various tasks that the user may require.

right click on tab. choose "switch rendering engine" or, to open IE with this URL, "open ext.app."

hold down right mouse while using scroll wheel or use context menu