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In ubuntu firefox, when I open a new tab, it does not appear in the bar at the top next to the existing tabs. Then I can't figure out how to switch between the hidden tab and the visible tabs. I must be missing something trivial, but I have no clue how to switch tabs.

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Screenshot?, do yo have add ons that may be interfering with that? – Uri Herrera Sep 7 '12 at 23:40
Check and see if Ctrl+Tab work. A hidden tab isn’t standard in Firefox – there should be a problem. – AliNa Mar 6 '13 at 22:26

To use Tab Groups, press Ctrl+Shift+E.

I think a video will explain it better:

You can also look at:

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