--- a/toolkit/themes/gnomestripe/mozapps/extensions/extensions.css
+++ b/toolkit/themes/gnomestripe/mozapps/extensions/extensions.css
@@ -46,22 +46,19 @@
   -moz-image-region: rect(0px, 84px, 21px, 63px);
 }
 
 #installFileButton[disabled="true"],
 #installUpdatesAllButton[disabled="true"] {
   -moz-image-region: rect(21px, 84px, 42px, 63px);
 }
 
-#checkUpdatesAllButton, #showUpdateInfoButton, #hideUpdateInfoButton {
+#showUpdateInfoButton, #hideUpdateInfoButton {
   -moz-image-region: rect(0px, 63px, 21px, 42px);
 }
-#checkUpdatesAllButton[disabled="true"] {
-  -moz-image-region: rect(21px, 63px, 42px, 42px);
-}
 
 #restartAppButton {
   -moz-image-region: rect(0px, 42px, 21px, 21px);
 }
 
 #restartAppButton[disabled="true"] {
   -moz-image-region: rect(21px, 42px, 42px, 21px);
 }

--- a/toolkit/themes/winstripe/mozapps/extensions/extensions.css
+++ b/toolkit/themes/winstripe/mozapps/extensions/extensions.css
@@ -45,22 +45,19 @@
   -moz-image-region: rect(0px, 84px, 21px, 63px);
 }
 
 #installFileButton[disabled="true"],
 #installUpdatesAllButton[disabled="true"] {
   -moz-image-region: rect(21px, 84px, 42px, 63px);
 }
 
-#checkUpdatesAllButton, #showUpdateInfoButton, #hideUpdateInfoButton {
+#showUpdateInfoButton, #hideUpdateInfoButton {
   -moz-image-region: rect(0px, 63px, 21px, 42px);
 }
-#checkUpdatesAllButton[disabled="true"] {
-  -moz-image-region: rect(21px, 63px, 42px, 42px);
-}
 
 #restartAppButton {
   -moz-image-region: rect(0px, 42px, 21px, 21px);
 }
 
 #restartAppButton[disabled="true"] {
   -moz-image-region: rect(21px, 42px, 42px, 21px);
 }