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This is useful for Firefox benchmarks (how well it handles multiple tabs via execution of a script).

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Did you look through about:config ? – Darth Android Sep 19 '12 at 20:26
up vote 2 down vote accepted
  1. Open a new tab and type into the address bar about:config?filter=dom.popup_maximum and press Enter. If you receive a warning, click the button that says "I'll be careful, I promise".
  2. Double click on the dom.popup_maximum preference and a popup will appear.
  3. Change the value to your choice (default is 20) and press OK.

More information on the preference.

Image for guidance.

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Type about:config into your address bar, reassure Firefox that you'll be careful and search for dom.popup_maximum. Change the value to whatever you'd like.

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