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!

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

Firefox 4.0 is not compatible with 3.6.x. Is there a hidden compatibility mode?

  • 2 replies
  • 5 have this problem
  • 8 views
  • Last reply by GregOpp

more options

I installed Firefox 4.0 and attempted to use it for three days. I found the new user interface to be significantly different from version 3.6. It was so clumsy to use that I re-installed 3.6. Is there a compatibility mode for 4.0 that preserves the 3.6 interface? If not, why not?

I installed Firefox 4.0 and attempted to use it for three days. I found the new user interface to be significantly different from version 3.6. It was so clumsy to use that I re-installed 3.6. Is there a compatibility mode for 4.0 that preserves the 3.6 interface? If not, why not?

All Replies (2)

more options

If you do not like the new appearance of Firefox 4 then you can change some setting to restore the Firefox 3 appearance.

You can right click the orange Firefox button to open the toolbar menu.

  • Click the Menu Bar entry to make the Menu Bar visible.
  • Click "Tabs on Top" to remove the check mark and place the Tab Bar at its original position just above the browser window.
more options

Thank you. I'll try it.