Chrome moves to permanently drop MV2 extensions, silencing uBlock Origin workarounds. After years of partial support, the browser has removed the kExtensionManifestV2Disabled flag, making MV2 add‑ons unavailable in future releases. The change follows security concerns and technical debt cited by Google engineer Devlin Cronin.

The shift means uBlock Origin and similar extensions can no longer survive via registry tweaks or legacy flags. Chromium 150 removed the ExtensionManifestV2Disabled option, while 151 will eliminate several MV2‑related flags. Opera and Microsoft Edge are expected to follow suit, leaving Brave and Vivaldi as the only Chromium browsers still supporting MV2.

Users relying on Chrome for ad‑blocking face two choices: switch to uBlock Origin Lite, an MV3 version, or abandon Chromium entirely for Firefox, which still supports both MV2 and MV3. The move tightens security but forces developers to migrate extensions to the newer Manifest V3 format.

Google Chrome, uBlock Origin, and MV3 mark the critical pivot in browser extension policy, reshaping the ad‑blocking ecosystem.