CHROME TO BOOT REMAINING AD BLOCKERS BY THE SUMMER

Two Chrome updates coming later this summer will tear out the last remaining workarounds for running ad blockers built on the older Manifest V2 platform, a change that effectively ends support for tools like uBlock Origin in Google's browser. Chrome 150 and 151, expected in late June and July, respectively, will remove the final bits of code referencing the older extensions system, leaving only Manifest V3-compliant alternatives on the table.

Google began phasing out Manifest V2 back in 2024, and by now, most Chrome users who relied on ad blockers have either switched to newer extensions like uBlock Origin Lite or moved to a different browser entirely. But there was still a narrow path for holdouts who kept the old extensions alive through technical workarounds. That path disappears for good with version 151.

WHAT CHANGES AND WHY

At the heart of the dispute is the shift from Manifest V2 to Manifest V3, an extension framework Google designed to tighten security and privacy controls across the browser. Under Manifest V3, extensions can no longer intercept network requests dynamically. That was the superpower that made full-featured ad blockers like uBlock Origin so effective: they could inspect every web request in real time and block undesirable content before it loaded. Manifest V3 replaces that with a declarative approach where extensions must submit predefined lists of filtering rules, narrowing what they can catch.

Google argues that the old model created security risks. It allowed extensions to read and modify virtually all browsing data, a power that malicious extensions could exploit. The new platform grants users more clarity about what an extension is doing and limits the blast radius of a compromised add-on.

The problem, critics say, is that the new approach is simply less capable. Manifest V3-compliant ad blockers on the Chrome Web Store exist, but they aren't as effective. uBlock Origin Lite, the official replacement, uses static filter lists and can't adapt to new ad-serving tricks as quickly as the original could. For users who want aggressive, dynamic blocking, Chrome is no longer an option.

WHAT ARE OUR OPTIONS

Users who rely on ad blocking and want the full power of Manifest V2 extensions have two straightforward alternatives. The first is switching to Firefox. Mozilla explicitly took a different approach: Firefox supports both Manifest V2 and Manifest V3 simultaneously, preserving backwards compatibility. The decision was deliberate. Mozilla has talked about why it made that choice, and it means uBlock Origin works in Firefox without modification.

The second is staying in Chrome but accepting the limitations of Manifest V3 blockers. For casual blocking needs, the newer tools still catch most trackers and ads, especially on common sites. Power users who run extensive custom filters or need per-site dynamic rules, however, will find the experience degraded. There is no technical remedy inside Chrome; Google has made clear it will not reverse course.

THE COMPANY'S POSITION IS STRAIGHTFORWARD

Chrome engineering director Devlin Cronin explained that maintaining Manifest V2 support is no longer viable due to the complexity, tech debt, and security issues it creates. "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 several bugs that are specific to MV2 lately). Of course, other browsers can continue supporting these if they so desire."

The statement reveals internal rationale: Google found bugs specific to the old system, and the company does not want to carry that maintenance burden across its user base of billions. That is a reasonable engineering decision. It also means Google is consciously trading away a feature set that a vocal minority of users values, betting that the security gains are worth the defections.

DOES IT MATTER FOR THE MAJORITY?

For the average Chrome user who has never installed an extension, the change is invisible. The browser continues to work exactly as before. For those who rely on ad blockers, many had already migrated after the 2024 phase-out. The rest are about to lose their grip.

The company has consistently framed Manifest V3 as a security improvement. But the effect is the same: the most effective ad-blocking tools on Chrome are being made impossible. Any user who wants the best possible ad blocking now has to leave Chrome or settle for less.

YOU HAVE TILL THE SUMMER

The two updates arrive on a predictable schedule. Chrome users who have not yet updated to a Manifest V3-compliant ad blocker should do so before version 151 ships. Those who refuse to downgrade their ad blocking should download Firefox. The door is closing, and once version 151 rolls out, the old guard of ad-blocking extensions on Chrome will be a memory.