"old" is a relative term, this style is for Firefox 2.0 versions - to restore to Firefox 1.5 functionality. Personally I use the Retro Find extension to use the "old" Find box from Firefox 0.8 versions, which doesn't suffer from ' and / problems, it only opens with {Ctrl + F}.
Wow, I do use the Classic Style Menus for Winstripe extension and this tightens things up even more, the best thing is that the scroll arrows on the Context Menu are gone!
About FireFox - Find Toolbar same as FF1.5 on Oct 15 2006
About Hide that grey space on the bottom on Oct 15 2006
About Adjust menu and separator height on Apr 14 2006
About Check marking visited links on Mar 28 2006
About 4 scrollbar arrows a scrollbar on Feb 25 2006
About Adblock + 7 status-bar icon change on Feb 25 2006