Chrome Version 150 Will Break Advanced Ad Blockers, Capping Extension Rules at 30,000

What's Actually Changing

Google's Manifest V3 transition isn't a minor under-the-hood tweak. It's a fundamental restructuring of how browser extensions interact with web content in Chrome.

Under the current system, Manifest V2, extensions like uBlock Origin functioned as something closer to a mini firewall than a simple blocklist. They could intercept and modify web requests in real-time, execute complex anti-tracking logic, and deploy anywhere from 80,000 to 300,000 filtering rules dynamically. According to ZDNet, Manifest V3 caps that at 30,000 static rules and substantially restricts the ability to dynamically block content.

The transition is expected to complete when Chrome 150 ships, rumored for around June 30. After that, any extension still relying on Manifest V2 architecture will stop functioning when users update to the latest Chrome release.

Google's Stated Rationale

Google says the move to Manifest V3 improves privacy, security, and performance. The older Manifest V2 system gave extensions sweeping access to every web request a browser made, which created real attack surface. ZDNet notes there were documented cases of Manifest V2 being abused, including a malicious extension called "Save Image as Type" that was used by scammers to exploit the broad permissions the old system allowed.

A system that lets any extension intercept and rewrite all browser traffic is also a system that bad actors can weaponize. Tightening those permissions has a legitimate security rationale, and the company isn't wrong that more constrained extensions are harder to compromise.

The Conflict of Interest That Can't Be Ignored

Google generated over $260 billion in advertising revenue in 2025, which ZDNet reports represents more than 70% of the company's total revenue. The company that profits most from ads being seen is also the company that controls the most popular browser on earth and is now limiting the tools users have to block those ads. Google does not have to have bad intentions for that conflict of interest to matter. The incentive structure alone deserves naming plainly.

What Users Actually Lose

Extensions built for Manifest V3 exist. uBlock Origin Lite, AdGuard, and Ghostery have all adapted. But according to ZDNet's own testing, even the updated versions let more ads through than their Manifest V2 predecessors, and the more advanced anti-tracking and anti-circumvention capabilities are gone.

This isn't just about blocking banner ads. Those advanced filtering rules were also what allowed security-conscious users to block malicious scripts, tracking pixels, and exploit-laden ad networks. Shrinking that capability makes the browser meaningfully less customizable for power users and potentially less safe for ordinary ones who relied on those extensions as a practical security layer.

ZDNet also flags a downstream risk: once Manifest V3 is fully locked in, advertisers are expected to accelerate their own anti-circumvention techniques, since the browser-level defenses against them will be substantially weaker.

What the Options Are Now

Users who want to keep Manifest V2-level ad blocking on Chrome version 150 and beyond will face a hard wall. The practical alternatives, as of June 25, 2026:

Switch browsers. Firefox has committed to maintaining Manifest V2 support, which means uBlock Origin's full feature set continues working there. Brave, which is Chromium-based but ships with its own built-in ad blocking that bypasses extension architecture entirely, is another option.

Stay on an older Chrome version. Not a serious long-term answer, given that older versions stop receiving security patches.

Use Manifest V3-compatible extensions and accept the reduced capability. uBlock Origin Lite, AdGuard, and Ghostery are the functional options in this lane.

Google has not answered publicly whether a 30,000-rule cap is a technical necessity imposed by the new architecture, or a policy choice made within it. If the cap is arbitrary rather than structural, it could be raised. No Google spokesperson has addressed that on the record.