diff --git a/platform/mv3/extension/js/dashboard.js b/platform/mv3/extension/js/dashboard.js
index b8c240d5c..d43f45c5b 100644
--- a/platform/mv3/extension/js/dashboard.js
+++ b/platform/mv3/extension/js/dashboard.js
@@ -36,3 +36,9 @@ dom.on('#dashboard-nav', 'click', '.tabButton', ev => {
 });
 
 /******************************************************************************/
+
+export function hashFromIterable(iter) {
+    return Array.from(iter).sort().join('\n');
+}
+
+/******************************************************************************/
diff --git a/platform/mv3/extension/js/filter-lists.js b/platform/mv3/extension/js/filter-lists.js
index ce62dc310..a609a7d53 100644
--- a/platform/mv3/extension/js/filter-lists.js
+++ b/platform/mv3/extension/js/filter-lists.js
@@ -22,6 +22,7 @@
 import { dom, qs$, qsa$ } from './dom.js';
 import { i18n, i18n$ } from './i18n.js';
 import { localRead, localWrite, sendMessage } from './ext.js';
+import { hashFromIterable } from './dashboard.js';
 
 /******************************************************************************/
 
@@ -403,6 +404,10 @@ const applyEnabledRulesets = (( ) => {
 
         dom.cl.remove('#lists .listEntry.toggled', 'toggled');
 
+        const unmodified = hashFromIterable(enabledRulesets) ===
+            hashFromIterable(cachedRulesetData.enabledRulesets);
+        if ( unmodified ) { return; }
+
         await sendMessage({
             what: 'applyRulesets',
             enabledRulesets,
diff --git a/platform/mv3/extension/js/settings.js b/platform/mv3/extension/js/settings.js
index 4c9352f6e..1a7812cbc 100644
--- a/platform/mv3/extension/js/settings.js
+++ b/platform/mv3/extension/js/settings.js
@@ -21,6 +21,7 @@
 
 import { browser, sendMessage } from './ext.js';
 import { dom, qs$ } from './dom.js';
+import { hashFromIterable } from './dashboard.js';
 import punycode from './punycode.js';
 import { renderFilterLists } from './filter-lists.js';
 
@@ -30,12 +31,6 @@ let cachedRulesetData = {};
 
 /******************************************************************************/
 
-function hashFromIterable(iter) {
-    return Array.from(iter).sort().join('\n');
-}
-
-/******************************************************************************/
-
 function renderAdminRules() {
     const { disabledFeatures: forbid = [] } = cachedRulesetData;
     if ( forbid.length === 0 ) { return; }