We all know that Mozilla has completely redesigned interface of Firefox 4.0. They have removed Statusbar, put tabs on top, made the Menubar hidden and made many other UI changes.
If you are new to Mozilla Firefox 4.0 and not getting used to the new UI, this topic will help you.
The default UI of Firefox 4.0 looks as following:

And after following this topic, the end result would be:

As you can there are many differences in both screenshots and in 2nd screenshot, Firefox 4.0 looks very much similar to Firefox 3.0.
So without wasting time, here are some simple steps to make Mozilla Firefox 4.0 look-like to Firefox 3.0:
Disable New Orange Button and Enable Menubar
Mozilla Firefox 4.0 comes with a new orange "Firefox" button in Titlebar which has replaced the good old Menu Bar.
Although it looks good but some users might find it difficult to use and annoying as it doesn't provide all menubar shortcuts and also hides the Titlebar text. So you can't see website titles in this way.
Following tutorial tells you how to get the good old Menu Bar back in Firefox 4.0 which will also disable the new orange "Firefox" button:
How to Disable New Orange “Firefox” Button in Titlebar & Get Menu Bar Back in Firefox 4.0
Put Tabs Back on Bottom
Mozilla Firefox 4.0 comes with Tabs on Top by default which might become quite difficult and annoying for existing Firefox users which are used to bottom tabs.
Following tutorial tells you how to put Tabs back on bottom as you used to get in older versions:
How to Put Tabs Back on Bottom in Mozilla Firefox 4.0
Get Statusbar Back
Mozilla has replaced Statusbar with new Add-on Bar which shows nothing except icons for installed add-ons.
If you also miss the progress meter and status text which used to shown in Status bar, take a look at following topic:
How to Get Good Old “Statusbar” with Text and Progress Meter Back in Mozilla Firefox 4.0
Get Back / Forward Dropmarker Back
Mozilla has removed the dropmarker from the back/forward button set. To show the recent pages drop-down list, you can either right-click on back or forward buttons or left-click and hold on back or forward buttons.
But you can get the dropmarker back using "Back/Forward Dropmarker" add-on.
Thanks to our reader "Rejjy13" for sharing it...
Few Other Things
Following tutorials will help you in getting some missing Firefox 3.0 features back and disabling new unnecessary features:
- How to Get Good Old “RSS Feed Icon” Back in Mozilla Firefox 4.0 Addressbar
- How to Get Separate “Stop” and “Reload” Buttons in Mozilla Firefox 4.0?
- How to Disable “Open New Tab After Current Tab” Feature in Mozilla Firefox?
- [Fix] Mozilla Firefox 4.0 Closes When You Close the Last Tab
- How to Bring Back “Save Tabs and Quit” Feature in Mozilla Firefox 4.0?
- How to Disable Hardware Acceleration (GPU Rendering) in Mozilla Firefox 4.0 to Fix Font Problem?
This article was posted by VG in following section: Mozilla Firefox.
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OMG
but firefox3 has no aero glass effect on its toolbars?
EGA
nice tutorial VG!
@OMG: if you want remove the aero effect try this : addons.mozilla.org/en-US/firefox/addon/firefox-3-theme-for-firefox/#reviews
Crond-Fx
«How to Make Mozilla Firefox 4.0 Look-Like Firefox 3.0»
What for?! =D
Uewd
Thank you very much.
Me
How can you forget Firefox 3 theme for Firefox 4?! This is must-have addon who loves Firefox 3 look.
addons.mozilla.org/en-US/firefox/addon/firefox-3-theme-for-firefox/
Fadly
i have a theme for firefox 4 for make look like old firefox 3 by Jeremy Morton
addons.mozilla.org/en-us/firefox/addon/firefox-3-theme-for-firefox/
leomate
Maybe somebody make Firefox 3 theme for 4 and its perfectly close like FF3 with aero glass effects :D
Prashant Ghai
Now why anybody wanna do that. It defeats the whole purpose of a new interface. Coz an average user can't even notice the back-end changes made to the browser.
Patrick
at least firefox 4 is so flexible enough to become firefox 3 interface,
IT Geek 2011
Now I can remember my old days using Firefox 3.0 on my Firefox 4.0.. Thanks for the post...