diff --git a/e2e/tests/manifest-content.test.ts b/e2e/tests/manifest-content.test.ts
index e344d07d..5ba736c4 100644
--- a/e2e/tests/manifest-content.test.ts
+++ b/e2e/tests/manifest-content.test.ts
@@ -599,4 +599,29 @@ describe('Manifest Content', () => {
       },
     );
   });
+
+  it('should respect the action field in the manifest without a popup', async () => {
+    const project = new TestProject();
+    project.setConfigFileConfig({
+      manifest: {
+        action: {
+          default_title: 'Hello world',
+        },
+      },
+    });
+
+    await project.build();
+
+    expect(await project.getOutputManifest()).toMatchInlineSnapshot(`
+      {
+        "action": {
+          "default_title": "Hello world",
+        },
+        "description": "Example description",
+        "manifest_version": 3,
+        "name": "E2E Extension",
+        "version": "0.0.0",
+      }
+    `);
+  });
 });
diff --git a/src/core/types/external.ts b/src/core/types/external.ts
index f8aa6945..439697cc 100644
--- a/src/core/types/external.ts
+++ b/src/core/types/external.ts
@@ -468,17 +468,13 @@ export interface ExcludableEntrypoint {
 export type UserManifest = Partial<
   Omit<
     Manifest.WebExtensionManifest,
-    | 'action'
     | 'background'
-    | 'browser_action'
     | 'chrome_url_overrides'
     | 'devtools_page'
     | 'manifest_version'
     | 'options_page'
     | 'options_ui'
     | 'sandbox'
-    | 'page_action'
-    | 'popup'
     | 'sidepanel'
     | 'sidebar_action'
   >
diff --git a/src/core/utils/manifest.ts b/src/core/utils/manifest.ts
index f7a23350..850f041b 100644
--- a/src/core/utils/manifest.ts
+++ b/src/core/utils/manifest.ts
@@ -214,18 +214,23 @@ function addEntrypoints(
       config.outDir,
       '.html',
     );
-    const options: Manifest.ActionManifest = {
-      default_icon: popup.options.defaultIcon,
-      default_title: popup.options.defaultTitle,
-      browser_style: popup.options.browserStyle,
-    };
+    const options: Manifest.ActionManifest = {};
+    if (popup.options.defaultIcon)
+      options.default_icon = popup.options.defaultIcon;
+    if (popup.options.defaultTitle)
+      options.default_title = popup.options.defaultTitle;
+    if (popup.options.browserStyle)
+      options.browser_style = popup.options.browserStyle;
     if (manifest.manifest_version === 3) {
       manifest.action = {
+        ...(manifest.action ?? {}),
         ...options,
         default_popup,
       };
     } else {
-      manifest[popup.options.mv2Key ?? 'browser_action'] = {
+      const key = popup.options.mv2Key ?? 'browser_action';
+      manifest[key] = {
+        ...(manifest[key] ?? {}),
         ...options,
         default_popup,
       };