Issue 4256 - Element Hiding Helper should use larger ABP icon on high-DPI screens

chrome/skin/devToolsOverlay.css

 /*
  * This Source Code is subject to the terms of the Mozilla Public License
  * version 2.0 (the "License"). You can obtain a copy of the License at
  * http://mozilla.org/MPL/2.0/.
  */
 
 @namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
 
 #ehh-inspector-toolbarbutton
 {
   list-style-image: url("chrome://adblockplus/skin/abp-status-16.png");
   -moz-image-region: rect(0px, 16px, 16px, 0px);
 }
 
+@media screen and (min-resolution: 1.5dppx)
+{
+  #ehh-inspector-toolbarbutton
+  {
+    list-style-image: url("chrome://adblockplus/skin/abp-status.png");
+    -moz-image-region: rect(0px, 24px, 24px, 0px);
+  }
+}
+
+@media screen and (min-resolution: 2dppx)
+{
+  #ehh-inspector-toolbarbutton
+  {
+    list-style-image: url("chrome://adblockplus/skin/abp-status-32.png");
+    -moz-image-region: rect(0px, 32px, 32px, 0px);
+  }
+}
+
 #ehh-inspector-toolbarbutton > image
 {
   filter: none;
 }