Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Stopping developer windows from opening

  • 2 replies
  • 1 has this problem
  • 5 views
  • Last reply by cor-el

more options

Sometimes when I go to a websites (cnn,msn, redit,ebay, amazon) the developer window opens. I when to about:config and turned all the items off but it is still happening.

The system is windows 7 with all patches, latest version of Java and firefox.

How do I stop this ?

Sometimes when I go to a websites (cnn,msn, redit,ebay, amazon) the developer window opens. I when to about:config and turned all the items off but it is still happening. The system is windows 7 with all patches, latest version of Java and firefox. How do I stop this ?

All Replies (2)

more options
  1. In the Location bar, type about:config and press Enter. The about:config "This might void your warranty!" warning page may appear.
  2. Click I'll be careful, I promise!, to continue to the about:config page.
more options

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Firefox/Tools > Add-ons > Appearance).

  • Do NOT click the Reset button on the Safe Mode start window.

Are you pressing any of the possible shortcut keys (F12, Ctrl+I/J or others) that might open the developer toolbar or Web Console are haven't you pressed any keys including the Ctrl key when this happens?