--- a/devtools/client/themes/computed.css
+++ b/devtools/client/themes/computed.css
@@ -59,17 +59,17 @@
 }
 
 .property-view-hidden,
 .property-content-hidden {
   display: none;
 }
 
 .property-view {
-  padding: 2px 0 2px 17px;
+  padding: 2px 17px;
   display: flex;
   flex-wrap: wrap;
 }
 
 .property-name-container {
   width: 202px;
 }
 
@@ -128,17 +128,21 @@
 
 .theme-firebug .property-view {
   border-bottom: 1px solid rgba(0, 0, 0, 0.1);
 }
 
 /* From skin */
 .expander {
   visibility: hidden;
-  margin-left: -12px !important;
+  margin-inline-start: -12px !important;
+}
+
+.expander:-moz-locale-dir(rtl) {
+  transform: scaleX(-1);
 }
 
 .expandable {
   visibility: visible;
 }
 
 .match {
   visibility: hidden;