diff --git a/spec/api-shell.spec.ts b/spec/api-shell.spec.ts
index f24785ce01..14a84e0cb2 100644
--- a/spec/api-shell.spec.ts
+++ b/spec/api-shell.spec.ts
@@ -14,7 +14,7 @@ import { ifdescribe, ifit, listen } from './lib/spec-helpers.ts';
 import { closeAllWindows } from './lib/window-helpers.ts';
 
 describe('shell module', () => {
-  describe('shell.openExternal()', () => {
+  describe('shell.openExternal()', { tags: ['serial'] }, () => {
     let envVars: Record<string, string | undefined> = {};
     let server: http.Server;
 
diff --git a/spec/api-web-contents-view.spec.ts b/spec/api-web-contents-view.spec.ts
index f38a044d6a..6e3cc0d897 100644
--- a/spec/api-web-contents-view.spec.ts
+++ b/spec/api-web-contents-view.spec.ts
@@ -603,7 +603,7 @@ describe('WebContentsView', () => {
     });
   });
 
-  describe('focusOnNavigation webPreference', () => {
+  describe('focusOnNavigation webPreference', { tags: ['serial'] }, () => {
     it('focuses the webContents on navigation by default', async () => {
       const w = new BrowserWindow();
       await once(w, 'focus');
@@ -614,7 +614,9 @@ describe('WebContentsView', () => {
       v.webContents.openDevTools({ mode: 'right' });
       await devToolsFocused;
       expect(v.webContents.isFocused()).to.be.false();
+      const focused = once(v.webContents, 'focus');
       await v.webContents.loadURL('data:text/html,<body>test</body>');
+      await focused;
       expect(v.webContents.isFocused()).to.be.true();
     });