The addon features are nice, the interface okay, the text is good readable and it renders images (something fbreader doesn't). To bad that internal links don't work (like in fbreader) and navigating seems only possible with arrow left/right or mouse scrolling.
Thanks for sharing this addon.

It works just fine, but the interface is ugly and not really intuitive.

I'm giving 4 stars in hope of the author to further improve it. It does show parts of a mobi file so it's working somewhat. I think currently it's having issues parsing separate chapters and jumping between them. Also I believe the right-click thing only works within the browser on .mobi url links, the author should clarify on that. Still, many thanks.

I just installed this. It actually does read mobi files. Clicking on the top right mobi icon loads a window with both an address bar and browse button. Could do with a bit of polish, e.g. close button etc, but it does the job it sets out to.