diff --git a/toolkit/components/aboutperformance/content/aboutPerformance.xhtml b/toolkit/components/aboutperformance/content/aboutPerformance.xhtml
index aa478f5e0ed6..92b2b1959852 100644
--- a/toolkit/components/aboutperformance/content/aboutPerformance.xhtml
+++ b/toolkit/components/aboutperformance/content/aboutPerformance.xhtml
@@ -48,24 +48,24 @@
         border-bottom: 1px solid var(--in-content-border-color);
         min-width: 40em;
       }
-      #dispatch-thead, #dispatch-tbody tr {
+      tr {
         display: table;
         table-layout: fixed;
         width: 100%;
       }
-      #dispatch-table td:nth-child(2) {
+      td:nth-child(2) {
         width: 8em;
       }
-      #dispatch-table td:nth-child(3) {
+      td:nth-child(3) {
         width: 9em;
       }
-      #dispatch-table td:nth-child(4) {
+      td:nth-child(4) {
         width: 5em;
       }
       #dispatch-tbody td:nth-child(4) {
         text-align: end;
       }
-      #dispatch-table td:nth-child(5) {
+      td:nth-child(5) {
         width: 20px;
       }
 
@@ -132,12 +132,12 @@
         transform: scale(1.2);
       }
 
-      #dispatch-table > thead > tr > td {
+      #dispatch-thead > tr > td {
         border: none;
         background-color: var(--in-content-box-background-hover);
         padding: 5px 10px;
       }
-      #dispatch-table > thead > tr > td:not(:first-child) {
+      #dispatch-thead > tr > td:not(:first-child) {
         border-inline-start-width: 1px;
         border-inline-start-style: solid;
         border-image: linear-gradient(transparent 0%, transparent 20%, #c1c1c1 20%, #c1c1c1 80%, transparent 80%, transparent 100%) 1 1;