--- a/mail/themes/gnomestripe/mail/primaryToolbar.css
+++ b/mail/themes/gnomestripe/mail/primaryToolbar.css
@@ -348,44 +348,44 @@ toolbar[iconsize="small"] #button-mark[d
 }
 
 toolbar[iconsize="small"] #button-next {
   list-style-image: url("chrome://messenger/skin/icons/mail-toolbar-small.png");
   -moz-image-region: rect(0px 160px 16px 144px);
 }
 
 toolbar[iconsize="small"] #button-next[disabled] {
-  -moz-image-region: rect(16px 160px 32px 144px);
+  -moz-image-region: rect(16px 160px 32px 144px) !important;
 } 
 
 toolbar[iconsize="small"] #button-next:-moz-locale-dir(rtl) {
   list-style-image: url("chrome://messenger/skin/icons/mail-toolbar-small.png");
   -moz-image-region: rect(0px 176px 16px 160px);
 }
 
 toolbar[iconsize="small"] #button-next:-moz-locale-dir(rtl)[disabled] {
-  -moz-image-region: rect(16px 176px 32px 160px);
+  -moz-image-region: rect(16px 176px 32px 160px) !important;
 } 
 
 toolbar[iconsize="small"] #button-previous {
   list-style-image: url("chrome://messenger/skin/icons/mail-toolbar-small.png");
   -moz-image-region: rect(0px 176px 16px 160px);
 }
 
 toolbar[iconsize="small"] #button-previous[disabled] {
-  -moz-image-region: rect(16px 176px 32px 160px);
+  -moz-image-region: rect(16px 176px 32px 160px) !important;
 } 
 
 toolbar[iconsize="small"] #button-previous:-moz-locale-dir(rtl) {
   list-style-image: url("chrome://messenger/skin/icons/mail-toolbar-small.png");
   -moz-image-region: rect(0px 160px 16px 144px);
 }
 
 toolbar[iconsize="small"] #button-previous:-moz-locale-dir(rtl)[disabled] {
-  -moz-image-region: rect(16px 160px 32px 144px);
+  -moz-image-region: rect(16px 160px 32px 144px) !important;
 }
 
 toolbar[iconsize="small"] #button-tag {
   list-style-image: url("chrome://messenger/skin/icons/mail-toolbar-small.png");
   -moz-image-region: rect(0px 192px 16px 176px);
 }
 
 toolbar[iconsize="small"] #button-tag[disabled] {