diff --git a/package-lock.json b/package-lock.json
index e0aa55d7..fbb76dcb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -33,8 +33,7 @@
         "prosemirror-utils": "1.0.0-0",
         "prosemirror-view": "1.30.0",
         "react-use": "^17.3.2",
-        "tslib": "^2.3.1",
-        "un": "0.0.0"
+        "tslib": "^2.3.1"
       },
       "devDependencies": {
         "@diplodoc/transform": "4.2.1",
@@ -24141,11 +24140,6 @@
         "node": ">=0.8.0"
       }
     },
-    "node_modules/un": {
-      "version": "0.0.0",
-      "resolved": "https://registry.npmjs.org/un/-/un-0.0.0.tgz",
-      "integrity": "sha512-Ysrl5s9YnTl7hVDOK2l5h2dKDne+/Q9FDbV5Hb1Mub1W8svfaqZj1xp/7XkzswJwzKpntT+L/9uDGLfPVsnRVA=="
-    },
     "node_modules/unbox-primitive": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/unbox-primitive/-/unbox-primitive-1.0.2.tgz",
diff --git a/package.json b/package.json
index e8546ba1..a2399e97 100644
--- a/package.json
+++ b/package.json
@@ -62,8 +62,7 @@
     "prosemirror-utils": "1.0.0-0",
     "prosemirror-view": "1.30.0",
     "react-use": "^17.3.2",
-    "tslib": "^2.3.1",
-    "un": "0.0.0"
+    "tslib": "^2.3.1"
   },
   "devDependencies": {
     "@diplodoc/transform": "4.2.1",
diff --git a/src/extensions/yfm/YfmTabs/YfmTabs.test.ts b/src/extensions/yfm/YfmTabs/YfmTabs.test.ts
index 06272216..a094ff4a 100644
--- a/src/extensions/yfm/YfmTabs/YfmTabs.test.ts
+++ b/src/extensions/yfm/YfmTabs/YfmTabs.test.ts
@@ -69,7 +69,7 @@ describe('YfmTabs extension', () => {
                                 role: 'tab',
                                 'aria-controls': generatedId,
                                 'aria-selected': 'true',
-                                tabindex: '0',
+                                tabindex: '-1',
                                 'data-diplodoc-is-active': 'true',
                                 'data-diplodoc-id': 'panel-title-1',
                                 'data-diplodoc-key': 'panel%20title%201',
@@ -83,7 +83,7 @@ describe('YfmTabs extension', () => {
                                 role: 'tab',
                                 'aria-controls': generatedId,
                                 'aria-selected': 'false',
-                                tabindex: '-1',
+                                tabindex: '0',
                                 'data-diplodoc-is-active': 'false',
                                 'data-diplodoc-id': 'panel-title-2',
                                 'data-diplodoc-key': 'panel%20title%202',
diff --git a/tests/esbuild-test/esbuild-tester.js b/tests/esbuild-test/esbuild-tester.js
index 94f8f201..c4df83d0 100644
--- a/tests/esbuild-test/esbuild-tester.js
+++ b/tests/esbuild-test/esbuild-tester.js
@@ -6,7 +6,7 @@
 
 const esbuild = require('esbuild');
 const fs = require('fs');
-const fsPrmosises = require('fs/promises');
+const fsPromises = require('fs/promises');
 const path = require('path');
 const {sassPlugin} = require('esbuild-sass-plugin');
 
@@ -15,6 +15,7 @@ const paths = {
     tempTest: path.join(__dirname, './temp-test.mjs'),
     localBuild: path.join(__dirname, './build'),
     compiledEsBuildToTest: path.join(__dirname, './build/esbuild-to-test.mjs'),
+    aliases: path.join(__dirname, './node-module-alias-fallback.js'),
 };
 
 const esbuildOptions = {
@@ -32,6 +33,8 @@ const esbuildOptions = {
         '.js': '.mjs',
     },
     plugins: [sassPlugin()],
+    platform: 'browser',
+    alias: ['fs', 'path', 'stream'].reduce((acc, name) => ({...acc, [name]: paths.aliases}), {}),
 };
 
 esbuild
@@ -39,7 +42,7 @@ esbuild
     .then(async () => {
         const allExports = (await import(paths.compiledEsBuildToTest)).default;
         // Make a file that exports everything from src
-        await fsPrmosises.writeFile(paths.tempTest, `import {${allExports}} from '../../src'`);
+        await fsPromises.writeFile(paths.tempTest, `import {${allExports}} from '../../src'`);
         await esbuild.build({...esbuildOptions, entryPoints: [paths.tempTest]});
     })
     .finally(() => {
diff --git a/tests/esbuild-test/node-module-alias-fallback.js b/tests/esbuild-test/node-module-alias-fallback.js
new file mode 100644
index 00000000..7646bbd1
--- /dev/null
+++ b/tests/esbuild-test/node-module-alias-fallback.js
@@ -0,0 +1 @@
+export default null;