Home / Articles / EOL Firebug Author Chris Coyier Comments Go to Comments Published Dec 7, 2016 Updated Dec 7, 2016 debugging firebug Easily manage projects with monday.com Direct Link → The Firebug extension isn't being developed or maintained any longer. We invite you to use the Firefox built-in DevTools instead. Looks like the end of an over 2 year process. Firebug was probably the single most important tooling advancement in front-end developments short life. A glimpse of the future, indeed.