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Why am I not warned when closing multiple tabs even though it is set in the preferences to do so ... using Version 4 on a MAC

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I have set the preferences to warn me when I close the browser window with multiple tabs open. No warning is given and the multiple tabs have to be reproduced every time I open. In previous versions I would be asked if I wanted to SAVE the tabs for the next session ... which I do. And, when opening Firefox the next time, the tabs would all be there.

I have set the preferences to warn me when I close the browser window with multiple tabs open. No warning is given and the multiple tabs have to be reproduced every time I open. In previous versions I would be asked if I wanted to SAVE the tabs for the next session ... which I do. And, when opening Firefox the next time, the tabs would all be there.

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You can use "History > Restore Previous Session" to get back the previous session.

There is also a "Restore Previous Session" button on the default about:home Home page.

Another possibility is to use:

  • Firefox > Preferences > General > Startup: "When Firefox Starts": "Show my windows and tabs from last time"

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