--- a/devtools/client/inspector/fonts/fonts.js
+++ b/devtools/client/inspector/fonts/fonts.js
@@ -429,17 +429,19 @@ class FontInspector {
    * @return {TextProperty|null}
    */
   getTextProperty(name, value) {
     if (!this.selectedRule) {
       return null;
     }
 
     let textProperty =
-      this.selectedRule.textProps.find(prop => prop.name === name);
+      this.selectedRule.textProps.find(prop =>
+        prop.name === name && prop.enabled && !prop.overridden
+      );
     if (!textProperty) {
       textProperty = this.selectedRule.editor.addProperty(name, value, "", true);
     }
 
     return textProperty;
   }
 
   /**