diff --git a/_locales/en/messages.json b/_locales/en/messages.json
index 2b1d4f87..a1529384 100644
--- a/_locales/en/messages.json
+++ b/_locales/en/messages.json
@@ -183,6 +183,13 @@
     "message": "Open color picker",
     "description": "Tooltip for the colored squares shown before CSS colors in the style editor."
   },
+  "configOnChange": {
+    "message": "on change",
+    "description": "VERY SHORT label for the checkbox in style config dialog after the save button - when enabled the changes in the dialog are saved and applied automatically without the need to press the Save button"
+  },
+  "configOnChangeTooltip": {
+    "message": "Autosave and apply changes automatically"
+  },
   "dysfunctional": {
     "message": "Stylus cannot function in private windows because Firefox disallows direct connection to the internal background page context of the extension.",
     "description": "Displayed in Firefox when its settings make Stylus dysfunctional"
diff --git a/js/prefs.js b/js/prefs.js
index 4eb5b0db..080b3a6a 100644
--- a/js/prefs.js
+++ b/js/prefs.js
@@ -11,6 +11,9 @@ var prefs = new function Prefs() {
     'exposeIframes': false,         // Add 'stylus-iframe' attribute to HTML element in all iframes
     'newStyleAsUsercss': false,     // create new style in usercss format
 
+    // checkbox in style config dialog
+    'config.autosave': true,
+
     'popup.breadcrumbs': true,      // display 'New style' links as URL breadcrumbs
     'popup.breadcrumbs.usePath': false, // use URL path for 'this URL'
     'popup.enabledFirst': true,     // display enabled styles before disabled styles
diff --git a/manage/config-dialog.css b/manage/config-dialog.css
index 9edc3e1a..639cc856 100644
--- a/manage/config-dialog.css
+++ b/manage/config-dialog.css
@@ -1,11 +1,11 @@
 /* config dialog */
-.config-dialog .config-heading {
+.config-heading {
   float: right;
   margin: -1.25rem 0 0 0;
   font-size: 0.9em;
 }
 
-.config-dialog label {
+.config-body label {
   display: flex;
   padding: .75em 0;
   align-items: center;
@@ -15,28 +15,28 @@
   position: static;
 }
 
-.config-dialog label:first-child {
+.config-body label:first-child {
   padding-top: 0;
 }
 
-.config-dialog label:last-child {
+.config-body label:last-child {
   padding-bottom: 0;
 }
 
-.config-dialog label:not(:first-child) {
+.config-body label:not(:first-child) {
   border-top: 1px dotted #ccc;
 }
 
-.config-dialog label > :first-child {
+.config-body label > :first-child {
   margin-right: 8px;
   flex-grow: 1;
 }
 
-.config-dialog label:not([disabled]) > :first-child {
+.config-body label:not([disabled]) > :first-child {
   cursor: default;
 }
 
-.config-dialog label:not([disabled]):hover > :first-child {
+.config-body label:not([disabled]):hover > :first-child {
   text-shadow: 0 0 0.01px rgba(0, 0, 0, .25);
   cursor: pointer;
 }
@@ -51,9 +51,9 @@
   font-style: italic;
 }
 
-.config-dialog input,
-.config-dialog select,
-.config-dialog .onoffswitch {
+.config-body input,
+.config-body select,
+.config-body .onoffswitch {
   width: var(--onoffswitch-width);
   margin: 0;
   height: 2em;
@@ -61,8 +61,8 @@
   vertical-align: middle;
 }
 
-.config-dialog .select-resizer,
-.config-dialog select {
+.config-body .select-resizer,
+.config-body select {
   width: auto;
   min-width: var(--onoffswitch-width);
   max-width: 124px;
@@ -70,24 +70,30 @@
   position: relative;
 }
 
-.config-dialog .onoffswitch {
+.config-body .onoffswitch {
   height: auto;
   margin: calc((2em - 12px) / 2) 0;
 }
 
-.config-dialog input[type="text"] {
+.config-body input[type="text"] {
   padding-left: 0.25em;
 }
 
-.config-dialog label > :last-child {
+.config-body label > :last-child {
   box-sizing: border-box;
   flex-shrink: 0;
 }
 
-.config-dialog label > :last-child:not(.onoffswitch):not(.select-resizer) > :not(:last-child) {
+.config-body label > :last-child:not(.onoffswitch):not(.select-resizer) > :not(:last-child) {
   margin-right: 4px;
 }
 
+#config-autosave-wrapper {
+  position: relative;
+  padding: 0 0 0 16px;
+  display: inline-flex;
+}
+
 .cm-colorview::before,
 .color-swatch {
   width: var(--onoffswitch-width) !important;
diff --git a/manage/config-dialog.js b/manage/config-dialog.js
index 6c6e3273..53043e20 100644
--- a/manage/config-dialog.js
+++ b/manage/config-dialog.js
@@ -46,10 +46,22 @@ function configDialog(style) {
   }
 
   function onshow(box) {
+    $('button', box).insertAdjacentElement('afterend',
+      $create('label#config-autosave-wrapper', {
+        title: t('configOnChangeTooltip'),
+      }, [
+        $create('input', {id: 'config.autosave', type: 'checkbox'}),
+        $create('SVG:svg.svg-icon.checked',
+          $create('SVG:use', {'xlink:href': '#svg-icon-checked'})),
+        t('configOnChange'),
+      ]));
+    setupLivePrefs(['config.autosave']);
+
     if (isPopup) {
       adjustSizeForPopup(box);
       box.style.animationDuration = '0s';
     }
+
     box.addEventListener('change', onchange);
     buttons.save = $('[data-cmd="save"]', box);
     buttons.default = $('[data-cmd="default"]', box);
@@ -62,8 +74,12 @@ function configDialog(style) {
     const va = target.va;
     if (va) {
       va.dirty = varsInitial[va.name] !== (isDefault(va) ? va.default : va.value);
-      target.closest('label').classList.toggle('dirty', va.dirty);
-      updateButtons();
+      if (prefs.get('config.autosave')) {
+        debounce(save, 100);
+      } else {
+        target.closest('label').classList.toggle('dirty', va.dirty);
+        updateButtons();
+      }
     }
   }