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"Warn me when closing multiple tabs" does not work on Mac Version 5.0.1

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The "question" says it all. Even though this box is checked in FireFox Preferences, it doesn't work on my iMac. The browser closes immediately. There is no pop-up with a question.

The "question" says it all. Even though this box is checked in FireFox Preferences, it doesn't work on my iMac. The browser closes immediately. There is no pop-up with a question.

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You can set the warn prefs on the about:config page to true via the right-click context menu or toggle the value with a double left-click.


To open the about:config page, type about:config in the location (address) bar and press the "Enter" key, just like you type the url of a website to open a website.
If you see a warning then you can confirm that you want to access that page.

  • Use the Filter bar at to top of the about:config page to locate a preference more easily.
  • Preferences that have been modified show as bold(user set).
  • Preferences can be reset to the default or changed via the right-click context menu.
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Hello Cor-el:

Boy, that's what I call genuine help. A great big thank you for being so thorough. You'd make a fine chess player.

Best regards, Bob Rasmussen