I have unchecked the option to warn when closing multiple tabs in preferences too.
Using Firefox 16.0.1 (the version that came with Mint 14).
Anyone know why/how I can fix this?
Thanks.

about:config


Vincent Vermeulen wrote:In the address bar of Firefox enter:
- Code: Select all
about:config
Accept the warning and proceed. Find the following settings and make sure those are set all to false (else double-click them to change to false):
- browser.tabs.warnOnClose
- browser.warnOnQuit


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