diggler was my all time favorite Mozilla/Firefox extension. Unfortunately it is not maintained anymore (version 0.9 was released in 2004) and it is not working in Firefox 1.5.
While customizing my toolbar I noticed a button called Up. It does almost the same thing as diggler! It turns out that this Up button is part of the Google Toolbar for Firefox.
Update: There is a similar extension called Digger, this will add a context menu to the Go button (just right-click on it). Also, it will add this context menu to the Go Up extension if installed, Go Up will take you up only one level, but it also has a shurtcut (Alt+Up).
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