Bug 1184790 - Force notifications to have opacity:1 when hovered to make sure that we show a readable notification during the intro/exit animation of the notification if the user has their mouse in the area. r=MattN

MozReview-Commit-ID: DccStz4VXCQ

--HG--
extra : rebase_source : f597a1e277dbec7933e8170f7d1d83d1f0f2a690

toolkit/themes/shared/alert-common.css

@@ -26,6 +26,12 @@
   animation-name: alert-closing-animation;
 }
 
+#alertBox[animate]:not([clicked]):not([closing]):hover {
+  /* !important is necessary because CSS animations have highest
+     importance in the cascade with exception to !important rules. */
+  opacity: 1 !important;
+}
+
 @keyframes alert-animation {
   from {
     opacity: 0;