Since I switched from Firefox 2 to Firefox 3, a long time ago, there has always been something I was missing: the Go button. Since then I've been installing some extension to restore it, but today I finally found the best solution: a file in the profile folder to make it visible.
First you have to find the folder that holds your current profile. Once you’ve opened it in your favorite file management program look for a directory named chrome. If the directory doesn’t exist go ahead and create it and drill down so you’re looking at the directory’s contents.
Once you’re in the chrome folder in your current Firefox 3 profile look for a file called userChrome.css. Again, if you don’t have a file by that name it’s ok, just go ahead and create a blank text document (text file for the Windows users) and call it userChrome.css. Open the file in a plain text editor (Notepad, Gedit, Geany, or whatever you prefer to use for editing text files, as long as it’s not a word processor like Word, WordPad or OpenOffice.org Word Processor). Once the file is open put this in at the end of it:
#urlbar[pageproxystate="valid"] > #urlbar-icons > #go-button { visibility: visible !important;}
Save the file and restart your Firefox and voila! The Go button should always be in your Location bar, ready for your use at any time.
Special thanks to Canyonero for pointing this out to us in the Mozillazine Forums.