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

Why I can't select device in the new Responsive Design Mode?

  • 2 respostas
  • 1 has this problem
  • 1 view
  • Last reply by cor-el

more options

After a very recent update to both Firefox and Firefox Dev I can no longer select device or add one? Why ???

Please refer to the provided images below for the old and new version !

After a very recent update to both Firefox and Firefox Dev I can no longer select device or add one? Why ??? Please refer to the provided images below for the old and new version !

All Replies (2)

more options

There was a problem with uploading the image, but here it is !

more options

You only get the new design where you can select a device when multi-process windows is enabled and working.

You can check that in "Help -> Troubleshooting Information".

In the Firefox 54 DE version you may have to check the browser.tabs.remote.autostart on the about:config page.