diff --git a/platform/mv3/safari/ext-compat.js b/platform/mv3/safari/ext-compat.js
index 772f17c81..3618ecd49 100644
--- a/platform/mv3/safari/ext-compat.js
+++ b/platform/mv3/safari/ext-compat.js
@@ -181,3 +181,43 @@ export const dnr = {
         return nativeDNR.setExtensionActionOptions(...args);
     },
 };
+
+/******************************************************************************/
+
+// Workaround for:
+// https://github.com/uBlockOrigin/uBOL-home/issues/515
+// https://bugs.webkit.org/show_bug.cgi?id=300236
+//
+// For each realm, we will force-reload registered rulesets once.
+
+const { windows } = webext;
+const  NORMAL_REALM = 0b01;
+const PRIVATE_REALM = 0b10;
+const ALL_REALMS = NORMAL_REALM | PRIVATE_REALM;
+let seenRealms = 0b00;
+
+async function forceEnableRulesets(windowId) {
+    if ( seenRealms === ALL_REALMS ) { return; }
+    if ( windowId === windows.WINDOW_ID_NONE ) { return; }
+    const details = await windows.get(windowId, { windowTypes: [ 'normal' ] });
+    const incognito = details?.incognito;
+    if ( typeof incognito !== 'boolean' ) { return; }
+    const currentRealm = incognito ? PRIVATE_REALM : NORMAL_REALM;
+    if ( (seenRealms & currentRealm) !== 0 ) { return; }
+    seenRealms |= currentRealm;
+    webext.storage.session.set({ __seenRealms: seenRealms });
+    const ids = await nativeDNR.getEnabledRulesets();
+    if ( ids.length === 0 ) { return; }
+    nativeDNR.updateEnabledRulesets({
+        disableRulesetIds: ids.slice(),
+        enableRulesetIds: ids.slice(),
+    });
+}
+
+windows.onFocusChanged.addListener(forceEnableRulesets);
+
+webext.storage.session.get('__seenRealms').then(bin => {
+    seenRealms |= bin?.__seenRealms ?? 0;
+}).catch(( ) => {
+});
+