diff --git a/.claude/skills/web-test/scripts/browser.mjs b/.claude/skills/web-test/scripts/browser.mjs
index 3bdae67c..65146710 100644
--- a/.claude/skills/web-test/scripts/browser.mjs
+++ b/.claude/skills/web-test/scripts/browser.mjs
@@ -1,4 +1,4 @@
-// web-test browser v1.11 — Playwright browser management for 1C web client
+// web-test browser v1.12 — Playwright browser management for 1C web client
 // Source: https://github.com/Nikolay-Shirokov/cc-1c-skills
 /**
  * Playwright browser management for 1C web client.
@@ -42,6 +42,10 @@ let highlightMode = false;
 // connect() does NOT use this Map — it preserves legacy single-session behavior for exec/run/start.
 const contexts = new Map();
 let activeContextName = null;
+// Isolation mode for the current cmdTest session — set by the first createContext call.
+// 'tab': all contexts share one persistent context (one window, multiple tabs, extension loads reliably).
+// 'window': each context gets its own BrowserContext (separate window per context, full cookie isolation, extension may not load).
+let activeMode = null;
 
 const LOAD_TIMEOUT = 60000;
 const INIT_TIMEOUT = 60000;
@@ -189,6 +193,7 @@ export async function disconnect() {
     }
     contexts.clear();
     activeContextName = null;
+    activeMode = null;
   }
 
   // Single-session path (connect): auto-stop recording if active
@@ -315,7 +320,7 @@ function _attachSessionListeners(pg, slot, name) {
  * Use this from run.mjs cmdTest only — exec/run/start use connect() and stay on the
  * legacy persistent-context path.
  */
-export async function createContext(name, url, { extensionPath } = {}) {
+export async function createContext(name, url, { extensionPath, isolation = 'tab' } = {}) {
   if (contexts.has(name)) {
     await setActiveContext(name);
     await page.goto(url, { waitUntil: 'domcontentloaded', timeout: LOAD_TIMEOUT });
@@ -325,35 +330,65 @@ export async function createContext(name, url, { extensionPath } = {}) {
     return await getPageState();
   }
 
-  // First context: launch browser. Subsequent: reuse existing browser.
-  if (!browser) {
+  if (!['tab', 'window'].includes(isolation)) {
+    throw new Error(`createContext: invalid isolation "${isolation}", expected 'tab' or 'window'`);
+  }
+  if (activeMode && activeMode !== isolation) {
+    throw new Error(`createContext: cannot mix isolation modes — first context used "${activeMode}", "${name}" requested "${isolation}". Use the same mode for all contexts in one run.`);
+  }
+
+  // First context: launch browser. Subsequent: reuse existing.
+  let isFirstContext = !browser;
+  if (isFirstContext) {
     const extPath = findExtension(extensionPath);
     const launchArgs = ['--start-maximized'];
     if (extPath) {
       launchArgs.push('--disable-extensions-except=' + extPath, '--load-extension=' + extPath);
     }
-    browser = await chromium.launch({ headless: false, args: launchArgs });
-  } else if (typeof browser.newContext !== 'function') {
-    throw new Error('createContext: existing browser was created via connect()/launchPersistentContext and cannot host additional isolated contexts. Call disconnect() first.');
+    if (isolation === 'tab') {
+      // Persistent context: extension loads reliably, one window with tabs per context
+      persistentUserDataDir = pathJoin(tmpdir(), 'pw-1c-test-' + Date.now());
+      mkdirSync(persistentUserDataDir, { recursive: true });
+      browser = await chromium.launchPersistentContext(persistentUserDataDir, {
+        headless: false,
+        args: launchArgs,
+        viewport: null,
+        permissions: ['clipboard-read', 'clipboard-write'],
+      });
+    } else {
+      // Window mode: separate BrowserContext per slot, full cookie isolation
+      browser = await chromium.launch({ headless: false, args: launchArgs });
+    }
+    activeMode = isolation;
   }
 
   // Save current active before switching
   _saveActiveSlot();
 
-  const newCtx = await browser.newContext({
-    viewport: null,
-    permissions: ['clipboard-read', 'clipboard-write'],
-  });
-  const newPage = await newCtx.newPage();
+  // Create slot — page differs by mode
+  let newCtx, newPage;
+  if (activeMode === 'tab') {
+    // Reuse the persistent context for all slots; each slot gets its own page (tab)
+    newCtx = browser;
+    if (isFirstContext) {
+      newPage = browser.pages()[0] || await browser.newPage();
+    } else {
+      newPage = await browser.newPage();
+    }
+  } else {
+    // Window mode: each slot owns its BrowserContext + page
+    newCtx = await browser.newContext({
+      viewport: null,
+      permissions: ['clipboard-read', 'clipboard-write'],
+    });
+    newPage = await newCtx.newPage();
+  }
 
   const slot = {
     context: newCtx,
     page: newPage,
     sessionPrefix: null,
     seanceId: null,
-    recorder: null,
-    lastCaptions: [],
-    lastRecordingDuration: null,
     highlightMode: false,
   };
   contexts.set(name, slot);
diff --git a/.claude/skills/web-test/scripts/run.mjs b/.claude/skills/web-test/scripts/run.mjs
index ef88cf67..96ab0148 100644
--- a/.claude/skills/web-test/scripts/run.mjs
+++ b/.claude/skills/web-test/scripts/run.mjs
@@ -1,5 +1,5 @@
 #!/usr/bin/env node
-// web-test run v1.8 — CLI runner for 1C web client automation
+// web-test run v1.9 — CLI runner for 1C web client automation
 // Source: https://github.com/Nikolay-Shirokov/cc-1c-skills
 /**
  * CLI runner for 1C web client automation.
@@ -396,11 +396,12 @@ async function cmdTest(rawArgs) {
   }
   // Build context registry: name → url. Supports config.contexts or single config.url / CLI url.
   // CLI url overrides default context's url.
-  const contextSpecs = {}; // name → { url }
+  const contextSpecs = {}; // name → { url, isolation }
   let defaultContextName = 'default';
+  const defaultIsolation = config.isolation || 'tab';
   if (config.contexts && typeof config.contexts === 'object' && Object.keys(config.contexts).length) {
     for (const [n, spec] of Object.entries(config.contexts)) {
-      contextSpecs[n] = { url: spec.url };
+      contextSpecs[n] = { url: spec.url, isolation: spec.isolation };
     }
     defaultContextName = config.defaultContext || Object.keys(config.contexts)[0];
     if (url) contextSpecs[defaultContextName] = { url }; // CLI override of default
@@ -504,7 +505,7 @@ async function cmdTest(rawArgs) {
     if (browser.hasContext(name)) return;
     const spec = contextSpecs[name];
     if (!spec) throw new Error(`Unknown context "${name}". Defined: [${Object.keys(contextSpecs).join(', ')}]`);
-    await browser.createContext(name, spec.url);
+    await browser.createContext(name, spec.url, { isolation: spec.isolation || defaultIsolation });
   }
 
   try {
diff --git a/tests/web-test/webtest.config.mjs b/tests/web-test/webtest.config.mjs
index 3906f7b6..03811a95 100644
--- a/tests/web-test/webtest.config.mjs
+++ b/tests/web-test/webtest.config.mjs
@@ -7,5 +7,10 @@ export default {
     b: { url: 'http://localhost:8081/webtest/ru_RU' },
   },
   defaultContext: 'a',
+  // isolation: 'tab' (default) — persistent context, tabs in one window, 1С extension loads.
+  //   Cookies are shared between tabs but scope by URL path, so different vrd-publications
+  //   give independent auth without extra isolation.
+  // isolation: 'window' — separate BrowserContext per slot, full cookie isolation,
+  //   extension may not load (Playwright limitation). Use only when really needed.
   timeout: 60000,
 };