diff --git a/code/addons/test/package.json b/code/addons/test/package.json
index 1652327a9801..56170beaa0e2 100644
--- a/code/addons/test/package.json
+++ b/code/addons/test/package.json
@@ -85,7 +85,6 @@
     "@storybook/icons": "^1.2.12",
     "@storybook/instrumenter": "workspace:*",
     "@storybook/test": "workspace:*",
-    "@storybook/theming": "workspace:*",
     "polished": "^4.2.2",
     "prompts": "^2.4.0",
     "ts-dedent": "^2.2.0"
diff --git a/code/addons/test/src/postinstall.ts b/code/addons/test/src/postinstall.ts
index fc7fc1e8d862..55f97eb6b0da 100644
--- a/code/addons/test/src/postinstall.ts
+++ b/code/addons/test/src/postinstall.ts
@@ -2,13 +2,17 @@ import { existsSync } from 'node:fs';
 import * as fs from 'node:fs/promises';
 import { writeFile } from 'node:fs/promises';
 
+import { traverse } from 'storybook/internal/babel';
 import {
   JsPackageManagerFactory,
   extractProperFrameworkName,
   loadAllPresets,
   loadMainConfig,
+  serverResolve,
   validateFrameworkName,
+  versions,
 } from 'storybook/internal/common';
+import { readConfig, writeConfig } from 'storybook/internal/csf-tools';
 import { colors, logger } from 'storybook/internal/node-logger';
 
 // eslint-disable-next-line depend/ban-dependencies
@@ -57,6 +61,51 @@ export default async function postInstall(options: PostinstallOptions) {
   // if Vitest is installed, we use the same version to keep consistency across Vitest packages
   const vitestVersionToInstall = vitestVersionSpecifier ?? 'latest';
 
+  const mainJsPath = serverResolve(resolve(options.configDir, 'main')) as string;
+  const config = await readConfig(mainJsPath);
+
+  const hasCustomWebpackConfig = !!config.getFieldNode(['webpackFinal']);
+
+  if (info.frameworkPackageName === '@storybook/nextjs' && !hasCustomWebpackConfig) {
+    const out = options.yes
+      ? {
+          migrateToExperimentalNextjsVite: true,
+        }
+      : await prompts({
+          type: 'confirm',
+          name: 'migrateToExperimentalNextjsVite',
+          message: dedent`
+            The addon requires the use of @storybook/experimental-nextjs-vite to work with Next.js.
+            https://storybook.js.org/docs/writing-tests/test-addon#install-and-set-up
+
+            Do you want to migrate?
+          `,
+          initial: true,
+        });
+
+    if (out.migrateToExperimentalNextjsVite) {
+      await packageManager.addDependencies({ installAsDevDependencies: true }, [
+        `@storybook/experimental-nextjs-vite@${versions['@storybook/experimental-nextjs-vite']}`,
+      ]);
+
+      await packageManager.removeDependencies({}, ['@storybook/nextjs']);
+
+      // eslint-disable-next-line no-underscore-dangle
+      traverse(config._ast, {
+        StringLiteral(path) {
+          if (path.node.value === '@storybook/nextjs') {
+            path.node.value = '@storybook/experimental-nextjs-vite';
+          }
+        },
+      });
+
+      await writeConfig(config, mainJsPath);
+
+      info.frameworkPackageName = '@storybook/experimental-nextjs-vite';
+      info.builderPackageName = '@storybook/builder-vite';
+    }
+  }
+
   const annotationsImport = [
     '@storybook/nextjs',
     '@storybook/experimental-nextjs-vite',
@@ -71,11 +120,16 @@ export default async function postInstall(options: PostinstallOptions) {
         )
       ? info.rendererPackageName
       : null;
+
   const isRendererSupported = !!annotationsImport;
 
   const prerequisiteCheck = async () => {
     const reasons = [];
 
+    if (hasCustomWebpackConfig) {
+      reasons.push('• The addon can not be used with a custom Webpack configuration.');
+    }
+
     if (
       info.frameworkPackageName !== '@storybook/nextjs' &&
       info.builderPackageName !== '@storybook/builder-vite'
@@ -149,9 +203,7 @@ export default async function postInstall(options: PostinstallOptions) {
     return;
   }
 
-  const interactionsAddon = info.addons.find((addon) => addon.includes(addonInteractionsName));
-
-  if (!!interactionsAddon) {
+  if (info.hasAddonInteractions) {
     let shouldUninstall = options.yes;
     if (!options.yes) {
       printInfo(
@@ -188,10 +240,9 @@ export default async function postInstall(options: PostinstallOptions) {
         ],
         {
           shell: true,
+          stdio: 'inherit',
         }
       );
-    } else {
-      return;
     }
   }
 
@@ -282,7 +333,7 @@ export default async function postInstall(options: PostinstallOptions) {
   logger.plain(colors.gray(`  ${vitestSetupFile}`));
 
   const previewExists = EXTENSIONS.map((ext) => resolve(options.configDir, `preview${ext}`)).some(
-    (config) => existsSync(config)
+    existsSync
   );
 
   const a11yAddon = info.addons.find((addon) => addon.includes(addonA11yName));
@@ -489,7 +540,7 @@ const getVitestPluginInfo = (framework: string) => {
     frameworkPluginCall = 'storybookReactNativeWeb()';
   }
 
-  // spaces for file identation
+  // spaces for file indentation
   frameworkPluginImport = `\n${frameworkPluginImport}`;
   frameworkPluginDocs = frameworkPluginDocs ? `\n    ${frameworkPluginDocs}` : '';
   frameworkPluginCall = frameworkPluginCall ? `\n    ${frameworkPluginCall},` : '';
@@ -507,7 +558,6 @@ async function getStorybookInfo({ configDir, packageManager: pkgMgr }: Postinsta
   const frameworkName = typeof framework === 'string' ? framework : framework?.name;
   validateFrameworkName(frameworkName);
   const frameworkPackageName = extractProperFrameworkName(frameworkName);
-  const addons = getAddonNames(config);
 
   const presets = await loadAllPresets({
     corePresets: [join(frameworkName, 'preset')],
@@ -519,6 +569,8 @@ async function getStorybookInfo({ configDir, packageManager: pkgMgr }: Postinsta
     isCritical: true,
   });
 
+  const hasAddonInteractions = !!(await presets.apply('ADDON_INTERACTIONS_IN_USE', false));
+
   const core = await presets.apply('core', {});
 
   const { builder, renderer } = core;
@@ -546,6 +598,7 @@ async function getStorybookInfo({ configDir, packageManager: pkgMgr }: Postinsta
     frameworkPackageName,
     builderPackageName,
     rendererPackageName,
-    addons,
+    hasAddonInteractions,
+    addons: getAddonNames(config),
   };
 }
diff --git a/code/addons/test/src/utils.ts b/code/addons/test/src/utils.ts
index 066f09af15f1..053f4eec4ffe 100644
--- a/code/addons/test/src/utils.ts
+++ b/code/addons/test/src/utils.ts
@@ -1,6 +1,5 @@
 import { type StorybookTheme, useTheme } from 'storybook/internal/theming';
-
-import type { StorybookConfig } from '@storybook/types';
+import type { StorybookConfig } from 'storybook/internal/types';
 
 import Filter from 'ansi-to-html';
 import stripAnsi from 'strip-ansi';
diff --git a/code/yarn.lock b/code/yarn.lock
index f0862ce5333e..e6f690cb347c 100644
--- a/code/yarn.lock
+++ b/code/yarn.lock
@@ -6403,7 +6403,6 @@ __metadata:
     "@storybook/icons": "npm:^1.2.12"
     "@storybook/instrumenter": "workspace:*"
     "@storybook/test": "workspace:*"
-    "@storybook/theming": "workspace:*"
     "@types/istanbul-lib-report": "npm:^3.0.3"
     "@types/node": "npm:^22.0.0"
     "@types/semver": "npm:^7"