diff --git a/lib/__tests__/web-push.test.ts b/lib/__tests__/web-push.test.ts
index ab7da8933..8358ad888 100644
--- a/lib/__tests__/web-push.test.ts
+++ b/lib/__tests__/web-push.test.ts
@@ -231,6 +231,32 @@ describe('enableWebPush', () => {
     expect(calls.some((c) => c.url.endsWith('/api/push/register/web'))).toBe(true);
   });
 
+  it('subscribes anyway when the browser cannot retrieve the existing subscription', async () => {
+    // Firefox rejects the lookup with `AbortError: Error retrieving push
+    // subscription` when its local record is stale; that must not abort enable.
+    const { registration } = installPushBrowser();
+    registration.pushManager.getSubscription.mockRejectedValue(
+      new DOMException('Error retrieving push subscription', 'AbortError'),
+    );
+    installFetch({});
+
+    const result = await enableWebPush({ client: makeClient([]), relayBaseUrl: RELAY });
+
+    expect(registration.pushManager.subscribe).toHaveBeenCalledTimes(1);
+    expect(result.subscriptionId).toBe('push-new');
+  });
+
+  it('still subscribes when unsubscribing the mismatched subscription fails', async () => {
+    const { browserSub, registration } = installPushBrowser();
+    browserSub.options.applicationServerKey = new Uint8Array([9, 9, 9]).buffer;
+    browserSub.unsubscribe.mockRejectedValue(new Error('unsubscribe failed'));
+    installFetch({});
+
+    await enableWebPush({ client: makeClient([]), relayBaseUrl: RELAY });
+
+    expect(registration.pushManager.subscribe).toHaveBeenCalledTimes(1);
+  });
+
   it('replaces a browser subscription whose key the browser does not expose', async () => {
     const { browserSub, registration } = installPushBrowser();
     browserSub.options.applicationServerKey = null;
diff --git a/lib/web-push.ts b/lib/web-push.ts
index b2e5a7399..363e7a1c2 100644
--- a/lib/web-push.ts
+++ b/lib/web-push.ts
@@ -424,12 +424,19 @@ export async function enableWebPush(
   // service on every send - Mozilla answers 401 "VAPID public key mismatch" -
   // while isWebPushEnabled keeps reporting push as on.
   const applicationServerKey = urlBase64ToUint8Array(vapidPublicKey);
-  let pushSubscription = await registration.pushManager.getSubscription();
+  // A stale or broken local record makes Firefox reject the lookup itself with
+  // `AbortError: Error retrieving push subscription`, which would abort the
+  // whole enable. There is nothing to reuse in that case, so carry on to
+  // subscribe() and let its own error surface if the push service is really
+  // unreachable.
+  let pushSubscription = await registration.pushManager.getSubscription().catch(() => null);
   if (
     pushSubscription
     && !sameKey(pushSubscription.options?.applicationServerKey, applicationServerKey)
   ) {
-    await pushSubscription.unsubscribe();
+    // An unsubscribe that fails leaves the old record in place; subscribing
+    // with the right key is what matters, so don't abort the enable for it.
+    await pushSubscription.unsubscribe().catch(() => undefined);
     pushSubscription = null;
   }
   if (!pushSubscription) {