--- a/toolkit/themes/shared/popupnotification.inc.css
+++ b/toolkit/themes/shared/popupnotification.inc.css
@@ -60,22 +60,20 @@
   padding: 0;
   min-width: 0;
   min-height: 41px;
   border: none;
   border-top: 1px solid var(--panel-separator-color);
 }
 
 .popup-notification-button:hover:not([disabled]) {
-  outline: 1px solid var(--arrowpanel-dimmed);
   background-color: var(--arrowpanel-dimmed);
 }
 
 .popup-notification-button:hover:active:not([disabled]) {
-  outline: 1px solid var(--arrowpanel-dimmed-further);
   background-color: var(--arrowpanel-dimmed-further);
   box-shadow: 0 1px 0 hsla(210,4%,10%,.05) inset;
 }
 
 .popup-notification-button[disabled] {
   background-color: var(--arrowpanel-dimmed-further);
   color: graytext;
 }