How do you remove the Firefox limit on (20) popups?

Question

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

Answer 1

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.

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Answer 2

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.