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Tab Scope is a Firefox Extension.

You can download it from the Firefox Add-Ons site.

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The Tab Scope extension allows you to preview the contents of a tab (in real-time) in a small popup window. You can also navigate the tab contents from the same popup window.

After installing the extension, just mouseover a tab to see how it works. Here’s an example:

 

 

As you can see, a small popup displays the contents of the tab.

You’ll also notice a small toolbar inside the popup window:

 

 

From this toolbar, you can navigate through the tab. You can also Refresh, Stop, and Close the tab.

Clicking on the magnifying glass will expand the size of the popup window. Here’s an example:

 

 

Finally, there are a few customizations that are available:

 

 

This extension is ideal for checking the contents of a tab without having to leave your current tab.