Rated 3 out of 5 stars

Great add on but a few things as others have pointed out:
- *Absolutely* need to be able to open chm files with firefox. Right now if you try to do so, firefox doesnt recognize the extension and tries to save the file.
- Ctrl-E shortcut doesnt work because it goes to the search bar. The choice of Ctrl-E was bad to begin with - should have been something less likely to be repeated.
- The idea of using the sidebar for the menu is IMO retarded because it's a global vs per-tab thing. It should be done with frames. Frames were *meant* for this.