Google is set to finalize its shift to Manifest V3 for Chrome extensions this summer, ending support for older ad blockers like uBlock Origin that rely on the outgoing Manifest V2 framework.
Chrome 150 is expected to arrive on June 30, with Chrome 151 following in July. The update will remove workarounds that kept MV2 extensions functional, cutting off access to the Web Request API—a key tool ad blockers use to filter traffic. These workarounds allowed users to temporarily reactivate disabled MV2 extensions, but the upcoming Chrome versions will eliminate that possibility, forcing a permanent transition.
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The transition has been in development since 2019, framed by Google as a security improvement. The Web Request API under MV2 permitted broad interception of network requests, which Google argued could be exploited by malicious extensions. Under MV3, extensions are restricted to the Declarative Net Request API, which relies on predefined rules rather than real-time request inspection, reducing flexibility for ad blockers. Critics contend this architectural change disproportionately affects content-filtering tools, as the new system imposes limits on the number of rules an extension can enforce, diminishing their effectiveness against dynamic or complex ad-serving techniques.
Other Chromium-based browsers like Microsoft Edge and Opera may follow Google’s lead, though Opera has said it plans to support MV2 extensions for as long as technically feasible. The company clarified that this support will depend on maintaining compatibility with Chromium’s evolving codebase, acknowledging that technical constraints may eventually force a full migration. Opera also indicated it would prioritize retaining widely used MV2 extensions while gradually deprecating those with lower adoption, signaling a more gradual phase-out compared to Google’s approach.
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Users losing their current ad blocker have a few options. Updated Manifest V3 versions of tools like uBlock Origin Lite, Adblock Plus, and Ghostery are available, though their filtering may be less effective. Additional alternatives include Adguard, which offers an MV3-compatible version with adjusted capabilities. Switching browsers is another path: Firefox, which runs on its own Gecko engine, continues to support traditional extension models, including full-featured ad blockers. Brave integrates a native ad-blocking system that doesn’t rely on extensions, while DuckDuckGo’s browser includes built-in tracker blocking, though its feature set differs from standalone ad blockers.
Ad blockers aren’t without trade-offs. They can reduce revenue for publishers by preventing ad impressions, which some users may wish to support through whitelisting or direct contributions. Additionally, extensions themselves can pose privacy risks, as some collect browsing data or telemetry. Reviewing an extension’s permission requests, privacy policy, and open-source status—where applicable—can help users assess whether an extension aligns with their security and transparency expectations.
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The change reflects Google’s long-term control over its ecosystem, as the company continues to shape the technical boundaries of Chrome’s extension platform. For users, it means either adapting to new tools with adjusted capabilities or abandoning Chrome entirely in favor of browsers with different extension policies.
