This is a nice add-on which adds icons to menus, but it has a number of compatibility problems.
1. It corrupts Norton Internet Security 2008's phishing toolbar. 2. It breaks Forebar Enhanced's options window 3. It breaks the Page Setup window in Firefox 3.0.
Also the author seems to have abandoned this extension and the home page never works.
If you run into any problems with other extensions, you'll most likely have to disable this extension, but if you don't use a lot of extensions and don't use the "Page setup" window in Firefox this is a nice add-on to have.