Chromium 150 Removes kExtensionManifestV2Disabled Flag
Chrome's final MV2 flags removal ends extension bypasses across Chromium browsers.
Chromium 150 removed the kExtensionManifestV2Disabled flag while version 151 eliminates ExtensionManifestV2Unsupported, ExtensionManifestV2Availability and AllowLegacyMV2Extensions options, per comments by Google engineer Devlin Cronin in the w3c WebExtensions Community Group GitHub repository.
Cronin stated MV2 extensions are no longer allowed in any supported Chrome version owing to technical debt and security bugs identified in recent audits, with the code slated for eventual removal though not wholesale deletion immediately.
Opera confirmed plans to drop MV2 review resources in developer correspondence received in 2024, while Edge initiated uBlock Origin disabling in February 2025, aligning both with the Chromium changes documented in the same thread.
AXIOM: Browser vendors are converging on identical extension policies that reduce user customization options.
Sources (2)
- [1]w3c WebExtensions Community Group GitHub(https://github.com/w3c/webextensions)
- [2]Chromium source commits on MV2 flags(https://chromium.googlesource.com/chromium/src)