Google is set to remove the remaining workarounds that have allowed older ad-blocking extensions to continue functioning in Chrome, according to a recent report by Cybernews.

According to the report, Chrome versions 150 and 151, expected to be released in late June and July, will eliminate the last pieces of code associated with Manifest V2, Google's previous browser extension framework. The change means that extensions built on Manifest V2, including the original version of uBlock Origin, will no longer function in Chrome from version 151 onward.

Google began phasing out Manifest V2 support in 2024 as part of its transition to Manifest V3, a newer extension platform that the company says offers improved security and privacy controls. Many users subsequently migrated to Manifest V3-compatible alternatives, such as uBlock Origin Lite, while others switched to browsers that continue to support Manifest V2 extensions.

According to Chromium development records, Google is now removing the final references to the older platform from the browser's codebase. The move effectively closes the remaining loopholes that allowed some legacy extensions to continue operating.

In comments attached to the Chromium project, Google developer Devlin Cronin said, “MV2 extensions are no longer allowed in any supported version of Chrome, and we are removing support for them and the associated functionality. We won’t be able to provide / maintain this functionality indefinitely due to the complexity and tech debt, as well as the security risks it entails (we’ve actually found a number of bugs that are specific to MV2 lately). Of course, other browsers can continue supporting these if they so desire.”