--- a/mobile/android/themes/core/aboutBase.css
+++ b/mobile/android/themes/core/aboutBase.css
@@ -53,29 +53,29 @@ body {
   color: #363B40;
   background-color: @color_about_item@;
   border-bottom: 1px solid @color_about_item_border@;
   position: relative;
   list-style-type: none;
   list-style-image: none;
   margin: 0px;
   padding: 0px;
-  min-height: -moz-calc(var(--icon-size) + var(--icon-margin) * 2);
+  min-height: calc(var(--icon-size) + var(--icon-margin) * 2);
 }
 
 .list-item:active {
   background-color: #eeeeee;
 }
 
 .list-item[isDisabled="true"] {
   color: #999999;
 }
 
 .inner {
-  -moz-margin-start: -moz-calc(var(--icon-size) + var(--icon-margin) * 2 - 1em);
+  -moz-margin-start: calc(var(--icon-size) + var(--icon-margin) * 2 - 1em);
   padding: 1em;
 }
 
 .icon {
   border: none;
   width: var(--icon-size);
   height: var(--icon-size);
   top: var(--icon-margin);

--- a/mobile/android/themes/core/aboutDownloads.css
+++ b/mobile/android/themes/core/aboutDownloads.css
@@ -11,17 +11,17 @@
 }
 
 #private-downloads-list .list-item {
   background-color: #393e43;
   color: #ddd;
 }
 
 .details {
-  -moz-margin-start: -moz-calc(var(--icon-size) + var(--icon-margin) * 2 - 1em);
+  -moz-margin-start: calc(var(--icon-size) + var(--icon-margin) * 2 - 1em);
   padding: 1em;
 }
 
 .date {
   color: gray;
   -moz-margin-start: 0.5em;
 }