fix flex bug in FF

app/assets/stylesheets/zammad.css.scss

@@ -62,6 +62,7 @@ blockquote {
   display: flex;
   flex: 1;
   min-width: $minWidth;
+  overflow: auto;
 }
 
 .u-unclickable {
@@ -807,7 +808,6 @@ textarea,
   transition: none;
   box-shadow: none;
   outline: none;
-  -webkit-appearance: none;
   appearance: none;
 }
 
@@ -1723,7 +1723,6 @@ footer {
 
 .tasks {
   background: #2c2d36;
-  overflow: auto;
   flex: 1;
 }
 
@@ -1950,7 +1949,7 @@ footer {
       visibility: visible;
     }
 
-  .search input {
+  .search input[type=search] {
     width: 100%;
     padding: 5px 33px 5px 33px;
     height: 30px;
@@ -1962,6 +1961,12 @@ footer {
     border-radius: 15px;
     position: relative;
     z-index: 1;
+    appearance: textfield;
+  }
+
+  input[type=search]::-webkit-search-cancel-button,
+  input[type=search]::-webkit-search-decoration {
+    -webkit-appearance: none;
   }
 
   .search .icon-magnifier {
@@ -2471,6 +2476,11 @@ footer {
       overflow-y: scroll;
     }
 
+    .label {
+      height: 2000px;
+      display: block;
+    }
+
     &.is-overflowing .popover-notificationsHeader {
       box-shadow:
         0 1px hsla(240,4%,95%,.5),