Every few days I have to go to Tools- Options to recheck "Warn me when closing multiple tabs." Is there a way to lock this so it doesn't keep changing back?

I've always assumed that this changes due to some update being pushed through. I'm using Windows 7 and Firefox 4.0.1

#Type '''about:config''' in the location bar where you normally type in a web address.<br><br>
#In the filter at the top, copy/paste the following: '''browser.tabs.warnOnClose'''<br><br>
#Double click it to change it to '''False'''. It will change to bold type.<br><br>
#Close the tab.
Should work.

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