diff --git a/mobile/android/themes/core/aboutReader.css b/mobile/android/themes/core/aboutReader.css
index 1a2959226b70..7a96b68da104 100644
--- a/mobile/android/themes/core/aboutReader.css
+++ b/mobile/android/themes/core/aboutReader.css
@@ -414,6 +414,19 @@ body.dark > .container > .content blockquote {
   margin-bottom: 20px !important;
 }
 
+table,
+th,
+td {
+  border: 1px solid currentColor;
+  border-collapse: collapse;
+  padding: 6px;
+  vertical-align: top;
+}
+
+table {
+  margin: 5px;
+}
+
 /* Covers all images showing edge-to-edge using a 
    an optional caption text */
 .moz-reader-content .wp-caption,
diff --git a/toolkit/themes/shared/aboutReader.css b/toolkit/themes/shared/aboutReader.css
index 89eb8ad5a7d9..d7dfaf0be761 100644
--- a/toolkit/themes/shared/aboutReader.css
+++ b/toolkit/themes/shared/aboutReader.css
@@ -729,6 +729,19 @@ button {
   list-style: decimal;
 }
 
+table,
+th,
+td {
+  border: 1px solid currentColor;
+  border-collapse: collapse;
+  padding: 6px;
+  vertical-align: top;
+}
+
+table {
+  margin: 5px;
+}
+
 /* Visually hide (but don't display: none) screen reader elements */
 .moz-reader-content .visually-hidden,
 .moz-reader-content .visuallyhidden,