Bug 478625 - Visual fixes for new-tab button on linux. r=dao

browser/themes/gnomestripe/browser/browser.css

@@ -1268,8 +1268,9 @@ tabpanels {
 
 /* Tabstrip new tab button */
 .tabs-newtab-button {
-  list-style-image: url(chrome://browser/skin/tabbrowser/newtab.png);
+  list-style-image: url("moz-icon://stock/gtk-add?size=menu");
   border: none;
+  margin-bottom: 1px;
 }
 
 .tabbrowser-arrowscrollbox > .tabs-newtab-button {
@@ -1277,7 +1278,7 @@ tabpanels {
 }
 
 .tabs-newtab-button > .toolbarbutton-icon {
-  margin: -1px 0 0;
+  margin: 0 0 -1px;
 }
 
 /* Tabstrip close button */

browser/themes/gnomestripe/browser/jar.mn

@@ -64,7 +64,6 @@ classic.jar:
 * skin/classic/browser/preferences/preferences.css    (preferences/preferences.css)
   skin/classic/browser/preferences/applications.css   (preferences/applications.css)
   skin/classic/browser/tabbrowser/alltabs.png          (tabbrowser/alltabs.png)
-  skin/classic/browser/tabbrowser/newtab.png           (tabbrowser/newtab.png)
   skin/classic/browser/tabbrowser/tabDragIndicator.png (tabbrowser/tabDragIndicator.png)
   icon.png
   preview.png