We pad the header label by four pixels on the left on Windows <http://mxr.mozilla.org/mozilla/source/toolkit/themes/winstripe/global/global.css#178> and Linux <http://mxr.mozilla.org/mozilla/source/toolkit/themes/gnomestripe/global/global.css#184>, which causes it to be misaligned with text in the sidebar itself, f.e. the "Search" label in the Bookmarks sidebar (see screenshot). It seems like we should remove this padding so the sidebar header and the text in the sidebar line up.

Bug 348784 should fix this, but in browser, not toolkit (I guess browser is better because it's so late right now).