diff --git a/browser/themes/linux/browser.css b/browser/themes/linux/browser.css
index c32cd9fc0f4..c747d43fcff 100644
--- a/browser/themes/linux/browser.css
+++ b/browser/themes/linux/browser.css
@@ -1099,7 +1099,7 @@ toolbarbutton[sdk-button="true"][cui-areatype="toolbar"] > .toolbarbutton-icon {
   border: none;
   background: none;
   min-width: 0;
-  list-style-image: url("chrome://global/skin/icons/question-16.png");
+  list-style-image: url("moz-icon://stock/gtk-dialog-question?size=16");
   cursor: pointer;
 }
 
@@ -1255,7 +1255,7 @@ toolbarbutton[sdk-button="true"][cui-areatype="toolbar"] > .toolbarbutton-icon {
 
 .default-notification-icon,
 #default-notification-icon {
-  list-style-image: url(chrome://global/skin/icons/information-16.png);
+  list-style-image: url(moz-icon://stock/gtk-dialog-info?size=16);
 }
 
 .identity-notification-icon,
@@ -1274,7 +1274,7 @@ toolbarbutton[sdk-button="true"][cui-areatype="toolbar"] > .toolbarbutton-icon {
 
 .indexedDB-notification-icon,
 #indexedDB-notification-icon {
-  list-style-image: url(chrome://global/skin/icons/question-16.png);
+  list-style-image: url(moz-icon://stock/gtk-dialog-question?size=16);
 }
 
 #password-notification-icon {
diff --git a/browser/themes/linux/downloads/allDownloadsViewOverlay.css b/browser/themes/linux/downloads/allDownloadsViewOverlay.css
index 323ead9d5a5..473e401c337 100644
--- a/browser/themes/linux/downloads/allDownloadsViewOverlay.css
+++ b/browser/themes/linux/downloads/allDownloadsViewOverlay.css
@@ -21,7 +21,7 @@
 }
 
 .blockedIcon {
-  list-style-image: url("chrome://global/skin/icons/Error.png");
+  list-style-image: url("moz-icon://stock/gtk-dialog-error?size=dialog");
 }
 
 .downloadTarget {
diff --git a/browser/themes/linux/downloads/downloads.css b/browser/themes/linux/downloads/downloads.css
index 7fbc756d103..78c2f429c9b 100644
--- a/browser/themes/linux/downloads/downloads.css
+++ b/browser/themes/linux/downloads/downloads.css
@@ -103,7 +103,7 @@ richlistitem[type="download"]:last-child {
 }
 
 .blockedIcon {
-  list-style-image: url("chrome://global/skin/icons/Error.png");
+  list-style-image: url("moz-icon://stock/gtk-dialog-error?size=dialog");
 }
 
 /* We hold .downloadTarget, .downloadProgress and .downloadDetails inside of