If you’ve spent any time tweaking Firefox 3, you’ve probably seen the warning message telling you that you probably shouldn’t be changing any settings. Thankfully you can remove the checkbox and make the message go away… but what if you wanted it back?

I know what you are thinking… why would you possibly want it back?


If you are customizing Firefox for somebody else and you turned the warning off… you might want to re-enable it after you are done to help prevent them from making changes.

Re-Enable about:config Warning

Type in about:config into the address bar, and then filter by the following:



Just double-click on the item to change the value back to true, and the warning message will show up again.

Lowell Heddings Lowell Heddings
Lowell is the founder and CEO of How-To Geek. He’s been running the show since creating the site back in 2006. Over the last decade, Lowell has personally written more than 1000 articles which have been viewed by over 250 million people. Prior to starting How-To Geek, Lowell spent 15 years working in IT doing consulting, cybersecurity, database management, and programming work.
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