diff --git a/manage/config-dialog.js b/manage/config-dialog.js
index 796ce88a..121c0e36 100644
--- a/manage/config-dialog.js
+++ b/manage/config-dialog.js
@@ -264,6 +264,7 @@ function configDialog(style) {
             type: va.type,
             onchange: updateVarOnChange,
             oninput: updateVarOnInput,
+            onfocus: focusInput,
           };
           if (va.type === 'range') {
             options.min = va.range[0];
@@ -313,6 +314,10 @@ function configDialog(style) {
     }
   }
 
+  function focusInput(event) {
+    event.target.select();
+  }
+
   function renderValues(varsToRender = vars) {
     for (const va of varsToRender) {
       const value = isDefault(va) ? va.default : va.value;