diff --git a/packages/app/e2e/support/developer-ui.mjs b/packages/app/e2e/support/developer-ui.mjs
index 6b9e199a6c..1d8a0d3533 100644
--- a/packages/app/e2e/support/developer-ui.mjs
+++ b/packages/app/e2e/support/developer-ui.mjs
@@ -1,11 +1,15 @@
+const HIDE_DEVELOPER_TOASTS = "#error-toast { display: none !important; }";
+
 /** @param {import('@playwright/test').Page} page */
 export async function hideDeveloperToasts(page) {
   // Developer chrome must not cover app actions or move the test's pointer/focus.
   // Console errors remain in the runner's logs. Hiding the toast, instead of clicking it away,
   // leaves no race with a toast that closes or is replaced between matching and clicking.
-  await page.addInitScript(() => {
+  await page.addInitScript((css) => {
     const style = document.createElement("style");
-    style.textContent = "#error-toast { display: none !important; }";
+    style.textContent = css;
     document.addEventListener("DOMContentLoaded", () => document.head.append(style));
-  });
+  }, HIDE_DEVELOPER_TOASTS);
+  // A page attached after it loaded (Electron over CDP) runs no init script until it navigates.
+  await page.addStyleTag({ content: HIDE_DEVELOPER_TOASTS });
 }
diff --git a/packages/desktop/e2e/browser-tabs.e2e.mjs b/packages/desktop/e2e/browser-tabs.e2e.mjs
index af142e6385..d403bfdfc3 100644
--- a/packages/desktop/e2e/browser-tabs.e2e.mjs
+++ b/packages/desktop/e2e/browser-tabs.e2e.mjs
@@ -12,7 +12,7 @@ import { fileURLToPath } from "node:url";
 import { experimental_createMCPClient } from "ai";
 import { StreamableHTTPClientTransport } from "@modelcontextprotocol/sdk/client/streamableHttp.js";
 import { chromium } from "playwright";
-import { installDeveloperToastDismissal } from "../../app/e2e/support/developer-ui.mjs";
+import { hideDeveloperToasts } from "../../app/e2e/support/developer-ui.mjs";
 import { runAppearanceFontSizeRegression } from "./appearance-font-size.electron.mjs";
 import { runSettingsMemoryRegression } from "./settings-memory.electron.mjs";
 
@@ -1189,7 +1189,7 @@ async function main() {
 
     browser = await chromium.connectOverCDP(`http://127.0.0.1:${cdpPort}`);
     const page = await waitForAppPage(browser, expoPort);
-    await installDeveloperToastDismissal(page);
+    await hideDeveloperToasts(page);
     const status = await waitForDesktopStatus(page);
 
     const checkPluginLinks = () =>