on linux, clicking in the url bar should not highlight the text. It wasn't consistent with nautilus, and it was messing the cut'n paste PRIMARY selection (see http://freedesktop.org/Standards/clipboards-spec/clipboards.txt)

browser/base/content/browser.js

@@ -73,8 +73,10 @@ var gLastValidURL = null;
 var gHaveUpdatedToolbarState = false;
 #ifdef XP_WIN
 var gClickSelectsAll = true;
-#else
+#elif XP_MACOSX
 var gClickSelectsAll = true;
+#else
+var gClickSelectsAll = false;
 #endif
 var gIgnoreFocus = false;
 var gIgnoreClick = false;