Tap the Alt key or press F10 to display the Menu Bar temporarily. Then make it permanent using

View > Toolbars > Menu Bar

You can use the other items on View > Toolbars to adjust your display back to the old style. (Note, the address/location bar is called the Navigation Toolbar on this menu.)

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I'm not sure why Mozilla doesn't have email support, but I think they want to encourage you to browse through the previous answers rather than end up in a very long queue of similar questions. (People ask this particular question several times a day...)

No matter how I played with it, it does not change back to what it was. It's similar. I will try to get used to it and if not I will change to another browser. It would be nice if there was a warning my page will be changed before I update.

See if you like this:

https://addons.mozilla.org/en-US/firefox/addon/firefox-3-theme-for-firefox/

The only thing it changed was my theme for google.

Did you remove the check-mark next to "Tabs on Top" ?

Which other changes do you want to revert?

You can right click the orange Firefox button to open the toolbar menu or use (F10) View > Toolbars.

• 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.

See also:

• http://www.computertechtips.net/64/make-firefox-4-look-like-ff-3-6/