Enable manifest v2 in Chrome 150

xiaoqing included in category Share

2026-09-03 2026-09-03 271 words 2 minutes

uBlock Origin disabled due to Chrome 151 completely removing Manifest V2? Learn how to downgrade to Chrome 150 and re-enable MV2 extensions via command-line flags and DevTools, plus Firefox and other alternatives.

Contents

Recently, I upgraded Chrome to version 151. After the upgrade, I found that the previous methods no longer worked to enable Manifest V2, and uBlock Origin could not be enabled.

Starting from Chrome 151, Manifest V2 is completely unsupported. Additionally, Manifest V2 extensions have been removed from the Chrome Web Store since August 31, 2026.

Ultimately, I downgraded to Chrome 150, but some features still failed to work properly—the integrated Google AI search button disappeared, and the Live Caption feature stopped functioning.

Fortunately, Firefox has no plans to deprecate Manifest V2. In the future, I will choose Firefox to run Manifest V2 extensions (such as uBlock Origin) specifically for watching YouTube, while leaving Chrome for occasional updates.

1 How to Enable Manifest V2 in Chrome 150

Chrome 150 is the last version to support Manifest V2.

Add the following parameters to the command line to enable Manifest V2 support:

text

 --disable-features=ExtensionManifestV2Unsupported

Since Chrome 150 forcibly disables Manifest V2 extensions, you may need to re-enable them every time you launch the browser.

Open the chrome://extensions page.
Press F12 or Ctrl+Shift+I to open Developer Tools, then press Ctrl+Shift+C and hover over the extension toggle button. Delete the "disabled" attribute from the code block below. This makes the toggle clickable again, allowing you to re-enable the extension.
extension enable button
html
```
<cr-toggle id="enableToggle" aria-describedby="a11yAssociation" aria-label="Off" role="button" tabindex="-1" disabled aria-pressed="false" aria-disabled="true">
```