



This will shrink the Go Button down to a very small, space saving size and gets rid of the text next to the icon.
Before
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After
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Your current code makes my go button overlap with the address bar. It's just too tight. The following code works better for me by adding some space to the sides of the button:
@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);
#go-button {
width: 0px !important;
margin-left: 2px !important;
margin-right: 1px !important;
padding-right: 0px !important;
padding-left: 0px !important;
}
.ad {
/* Your ad can be here instead. 10K unique visitors for $5/day. Mail me. */
}