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Separate Tabs is a Firefox Extension.

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

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This extension automatically groups your tabs by the host URL.

For example, below you’ll see two tabs that have different host URL’s. They are separated by a vertical orange bar:

 

 

Now lets create a new tab for Google Bookmarks. Since it has the same host URL as Google Search, it will be grouped with it:

 

 

Add a tab for Google Reader, and once again it will automatically be placed next to the other Google sites:

 

 

What if you create a tab for www.Live.com?

Since it has a different host URL than all other tabs, it will have it’s own section:

 

 

Can you still drag-and-drop tabs?

Yes, but if you drag it out of its section, it will automatically be put back when you create a new tab.

This extension can be helpful if you have lots of tabs open at once and you’d like a general overview of where everything is located.