Thanks, I did that. But I'd also like the 'Home' button in the navigation bar back on the left side like it was with previous versions. Can that be done?
This is one of the first things I did. Right click the tool bar, select "Customise...", and the "Customise Toolbar" box appears. It's full of little icons representing toolbar elements. Now you can drag toolbar elements (including the Home button) into and out of the box, but you can also drag them to other locations on the toolbar. It actually spells "Customise" the British way with an 's', I don't know if that's because of my Windows locale settings or whether it's standard for all English language versions.
Another thing I missed was the drop down history arrow on the back and forward buttons. You can get the same menus to appear by either right clicking the buttons or by a left click and hold, but if you hanker after the old dropdown arrow there is an addon called Backward Forward History Dropdown which I got here
http://kuix.de/mozilla/backforedrop/Yet another thing I did (which some people might think was retrograde) was to install Firefox 3 theme for Firefox 4, available here
http://ffaddons.game-point.net/ff3ff4/This theme restores the look of Firefox 3 to the Firefox 4 interface. In Firefox 4, the default GUI has been changed dramatically to favour a 'minimalist' UI. Even if one restores large icons, the theme on Windows forcibly resizes the icons so that they stay small. The default icon glyphs provided with the Firefox 4 theme are also rather dull and lifeless, with all the colour sucked out of them.
I agree with some of this - I like small icons but I do find the default FF4 theme a bit lifeless.
With this theme installed and the Firefox 3 look and feel restored, you will once again be able to display large toolbar icons at their correct size. The default icons have also been restored to their Firefox 3 equivalents. The rest of the Firefox 4 interface by and large stays the same, as it's not as dull and minimalistic as the toolbar. For example, the icons for categories along the top of the 'Options' dialog have not been changed.
Finally I checked "Menu Bar" in View - Toolbars.