--- a/browser/themes/shared/syncedtabs/sidebar.inc.css
+++ b/browser/themes/shared/syncedtabs/sidebar.inc.css
@@ -84,32 +84,34 @@ body {
 .client .item.tab > .item-title-container {
   padding-inline-start: 35px;
 }
 
 .item.tab > .item-title-container {
   padding-inline-start: 20px;
 }
 
-.item.client.device-image-desktop > .item-title-container > .item-icon-container {
-  background-image: url("chrome://browser/skin/sync-desktopIcon.svg#icon");
-}
-
 .item.client.device-image-desktop.selected > .item-title-container > .item-icon-container {
   background-image: url("chrome://browser/skin/sync-desktopIcon.svg#icon-inverted");
 }
 
-.item.client.device-image-mobile > .item-title-container > .item-icon-container {
-  background-image: url("chrome://browser/skin/sync-mobileIcon.svg#icon");
+.item.client.device-image-desktop:not(.selected) > .item-title-container > .item-icon-container,
+.item.client.device-image-desktop.selected > .item-title-container > .item-icon-container:-moz-window-inactive {
+  background-image: url("chrome://browser/skin/sync-desktopIcon.svg#icon");
 }
 
 .item.client.device-image-mobile.selected > .item-title-container > .item-icon-container {
   background-image: url("chrome://browser/skin/sync-mobileIcon.svg#icon-inverted");
 }
 
+.item.client.device-image-mobile:not(.selected) > .item-title-container > .item-icon-container,
+.item.client.device-image-mobile.selected > .item-title-container > .item-icon-container:-moz-window-inactive {
+  background-image: url("chrome://browser/skin/sync-mobileIcon.svg#icon");
+}
+
 .item.tab > .item-title-container > .item-icon-container {
   background-image: url("chrome://mozapps/skin/places/defaultFavicon.png");
 }
 
 @media (min-resolution: 1.1dppx) {
 .item.tab > .item-title-container > .item-icon-container {
     background-image: url("chrome://mozapps/skin/places/defaultFavicon@2x.png");
   }