What's New in DevTools (Microsoft Edge 142) (#3620)

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Co-authored-by: leahmsft <leahtu@microsoft.com>

Author: mikehoffms

microsoft-edge/devtools/whats-new/2025/10/devtools-142-images/activity-bar.png

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+---
+title: What's New in DevTools (Microsoft Edge 142)
+description: Activity Bar horizontal in Edge 144. Application tool storage inspection for all worker types.  :target-current in Elements tool Styles tab.  Network tool filters requests on Is ad-related boolean. # key words before col 158
+author: MSEdgeTeam
+ms.author: msedgedevrel
+ms.topic: conceptual
+ms.service: microsoft-edge
+ms.subservice: devtools
+ms.date: 10/30/2025
+---
+# What's New in DevTools (Microsoft Edge 142)
+
+These are the latest features in the Stable release of Microsoft Edge DevTools.
+
+
+<!-- ====================================================================== -->
+## Activity Bar will only appear horizontally in Edge 144
+
+<!-- Subtitle: Starting with Microsoft Edge 144, the vertical Activity Bar will no longer be supported.-->
+
+Upcoming change:
+
+Starting with Microsoft Edge 144, the **Activity Bar** will always be displayed horizontally, at the top of the DevTools window.  Displaying the **Activity Bar** vertically will no longer be supported.
+
+![Horizontal Activity Bar](./devtools-142-images/activity-bar.png)
+
+
+<!-- ====================================================================== -->
+## Announcements from the Chromium project
+
+Microsoft Edge 142 also includes the following updates from the Chromium project:
+
+* [Miscellaneous highlights](https://developer.chrome.com/blog/new-in-devtools-142#misc)
+
+
+<!-- ====================================================================== -->
+## See also
+
+* [What's New in Microsoft Edge DevTools](../../whats-new.md)
+* [Release notes for Microsoft Edge web platform](../../../../web-platform/release-notes/index.md)

microsoft-edge/devtools/whats-new/2025/10/devtools-142.md

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               href: ./devtools/whats-new/whats-new.md
               displayName: release notes, announcements
 # latest 10 What's New
+            - name: Microsoft Edge 142
+              href: ./devtools/whats-new/2025/10/devtools-142.md
+              displayName: What's New in DevTools (Microsoft Edge 142)  # page title
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             - name: Microsoft Edge 141
               href: ./devtools/whats-new/2025/10/devtools-141.md
               displayName: What's New in DevTools (Microsoft Edge 141)  # page title
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               href: ./devtools/whats-new/2025/02/devtools-133.md
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-            - name: Microsoft Edge 132
-              href: ./devtools/whats-new/2025/01/devtools-132.md
-              displayName: What's New in DevTools (Microsoft Edge 132)  # page title
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+                - name: Microsoft Edge 132
+                  href: ./devtools/whats-new/2025/01/devtools-132.md
+                  displayName: What's New in DevTools (Microsoft Edge 132)  # page title
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                 - name: Microsoft Edge 131
                   href: ./devtools/whats-new/2024/11/devtools-131.md
                   displayName: What's New in DevTools (Microsoft Edge 131)  # page title