When browsing the Internet with Firefox, sometimes you open so many tabs that you end up not knowing where is each webpage you opened a few minutes ago. The solution is Tab Scope, a Firefox extension which enables you to preview the each tab's contents in a preview window opened just below the tab.

The preview window offers real time content with buttons you can use to actually navigate through the site, support for page scrolling with your mouse wheel and two sizes available for smaller or larger preview images that you can customize in the extension's configuration options.