Firefox Tabs-in-Tab : A Firefox Trick

Amuse your friends with this tabs-in-tab hack (not a hack, just a trick).
It opens tabs in a tab of Firefox which can help you to divide the crowd of the tabs among the sub-tabs….
Check this yourself…(and tell others too!)
Paste it in the address bar of Firefox and hit Enter:

chrome://browser/content/browser.xul

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