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I realize Firefox 4 is still beta, but I'm wondering if anyone knows of an addon which will allow you to group tabs as in Opera's tab "stacking". I find this much nicer than Firefox's tab "groups".

For more details, see this link.

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Using the PRE version of Tab Utilies you can do this.

Some of the settings are hidden though, and you need to go into about:config and then in the filter bar type in extensions.tabutilities. and you will find in there settings for the stacking and auto-stacking.

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Of course, by now I'm no longer running on 4 Beta, but rather 10 Beta. B) – eidylon Jan 24 '12 at 17:58

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