I like the idea of being able to preview my tabs without clicking on them – but for the power hungry user, sometimes they need more.
The Firefox extension Tab Scope promises to deliver in this department. Here are some of the features:

Real-time preview of tab contents
Navigate (Back/Forward/Reload/Stop) through popup
Scroll pages or frames in preview with mouse wheel
Click links or buttons directly in preview

It gives you simple navigation tools to make your way around that preview image. [...]