For those who love using tabs, but tend to fill up the tab strip, Tab Groups are the perfect solution. With Tab Groups, you can sort your tabs in sets. This works well if you want to organize tabs by task or function.

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Firefox 4 Tips: Using Tab Groups

Opera 10.5 now has the ability to save browsing sessions directly within Opera without installing an Opera widget. You can save multiple sessions that may even include tabs from multiple open Opera windows. NOTE: The menu bar in Opera can be hidden and is hidden by default when you first install the program.

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Save and Manage Browsing Sessions in Opera

Do you want an easy way to extend the functionality of the tabs in Firefox? Tabberwocky provides many features to enhance the usability of the tabs, including the ability to duplicate, protect, and lock tabs, and to have a multi-row tab bar and new and close tab buttons, and to customize the context menu for the tabs

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Increase the Functionality of Your Firefox Tabs

If you use Microsoft Office a lot (I use it pretty much everyday), you might be interested in slightly increasing your efficiency when using Word, Excel, or PowerPoint. How so you might ask?

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Add multiple tabs to Word, Excel and Powerpoint

If you use Microsoft Office a lot (I use it pretty much everyday), you might be interested in slightly increasing your efficiency when using Word, Excel, or PowerPoint. How so you might ask

The rest is here:
Add multiple tabs to Word, Excel and Powerpoint