Too many tabs? Here is a neat little trick/hack I discovered that will let you open a Firefox window nested within a tab in an existing Firefox window.

The Trick

The trick is simple, simply enter this in your address bar

chrome://browser/content/browser.xul

Advantages

• This can really help you organize your tabs by grouping related tabs together in a single tab.
• You can hide an entire browser session a few levels deep and if your boss walks by, simply switch to another tab at the top level. Your tabs will be hidden and the only thing that will be displayed in the parent tab are the words “Mozilla Firefox” (most of the time).
• Prank/confuse co-workers

Disadvantages

• Having recursive Firefox windows open will reduce screen estate — especially if you have many toolbar add-ons.
• Some shortcuts won’t work as expected. For example, double clicking on the tab bar to open a new tab in a sub-window will open new tabs in the root (highest parent) window as well.
• There are a few other quirks. The address bar doesn’t update when you switch sub-tabs. And the title in the tab gets updated weirdly.
• Restoring a closed tab containing sub windows will (most often) not restore the tabs previously open.

This should work on older versions of Firefox but I only tested it on Let me know if it works in Firefox 1.x or 2.x

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