The release candidate of Firefox 3.6 is finally out, but if you install it, any extension that still hasn’t been updated to support the latest release is going to error out or just not work.

What you’ll need to do is use the new compatibility hack to get it working. And before you start talking about nightly tester tools and other extensions to force compatibility, some of us don’t want to bloat up Firefox with yet another extension, and prefer the about:config hack instead.

How To Force Extension Compatibility with Firefox 3.6+

You can click the link to read the full description, or just create a new boolean key with this name, and value set to false:


The new version of Firefox adds a bunch of features like Personas themes that can switch without restarting the browser, notifications for ancient, insecure versions of Flash, and a bunch of extra stuff that will speed up the browser.

Download Firefox 3.6 Release Candidate 1 from

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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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