Chrome removes all Manifest V2 extensions on August 31: what it means for you

Google will permanently delete every remaining Manifest V2 extension from the Chrome Web Store on August 31, 2026. If you still rely on an old extension that never made the jump to Manifest V3 — or if you have been putting off checking — here is what actually changes, what already changed, and what you should do before the deadline.

Google Chrome logo with the multicoloured circle icon and grey Chrome wordmark on a white background
Image: Google

What has already happened

The August 31 date is the final cleanup, not the big disruption. The big disruption already happened. Chrome 138 disabled Manifest V2 extensions for every user back in July 2025, and Chrome 139 removed the last enterprise workaround shortly after. If your extensions are working today on a current version of Chrome, they are already running on Manifest V3 — you have nothing to worry about.

What August 31 does is remove the leftover MV2 listings from the Web Store entirely. After that date, no one can find, install, or reinstall those extensions. Any MV2 extension still sitting installed on a very old Chrome build (138 or earlier) will remain in place but will never receive another update.

Why this matters: the ad-blocker problem

The transition from Manifest V2 to V3 was never just a technical formality. Google pitched V3 as a security and performance upgrade, but it also replaced the webRequest API — the mechanism that let extensions like uBlock Origin intercept and block network requests in real time — with a more limited system called declarativeNetRequest. Extensions now have to declare their filtering rules upfront instead of reacting dynamically to what a page loads.

For ad blockers, that is a meaningful downgrade. The original uBlock Origin, widely considered the most effective free ad blocker available, was built entirely on MV2. Its creator, Raymond Hill, developed a Manifest V3 replacement called uBlock Origin Lite, but the trade-offs are real:

  • No dynamic filtering — uBlock Origin Lite cannot watch and react to requests on the fly the way the original did. It relies on pre-declared rule sets.
  • Weaker tracker blocking — the Lite version handles standard ads effectively but is less thorough against trackers and anti-adblock systems.
  • Slower filter updates — the original could pull updated block lists on demand; Lite depends on the extension’s own release cycle in the Web Store.
  • Streaming ads slip through — video-platform ads and evolving ad formats that the original caught dynamically are harder for the static rule approach to handle.

If you are a Chrome user who relied on uBlock Origin and switched to uBlock Origin Lite, you already know it is not the same experience. That is not a bug — it is a structural consequence of how Google redesigned the extension platform.

What you should do before August 31

For most Chrome users, nothing. If your browser is up to date and your extensions work, they are already V3. But there are a few cases worth checking:

  1. Check your extensions page. Open chrome://extensions in your address bar. Any extension with a warning badge or marked as disabled was likely an MV2 holdover. Look for a V3 replacement in the Web Store now — after August 31, the old listing will be gone and you will not be able to reference it to find the replacement.
  2. If you use uBlock Origin Lite and find it lacking, consider switching to Firefox. Mozilla kept the webRequest API, and the full uBlock Origin still works there with no compromises. Brave, another Chromium-based browser, also has its own built-in ad blocking that does not depend on the extension system at all.
  3. If you run a very old Chrome version deliberately (some users froze at Chrome 138 to keep MV2 extensions alive), understand that you are running a browser with over a year of unpatched security vulnerabilities. That is a serious risk, and it will only get worse. The extensions you are preserving will never be updated either.

The bigger picture

Google framed Manifest V3 as a user-safety measure — extensions that declare their rules upfront are harder to abuse for data theft or malicious injection. That is true, as far as it goes. But the same change also made it structurally harder for independent ad blockers to compete with Google’s own advertising business, and Google never had to publicly reconcile those two outcomes. The company that serves more ads than anyone else on the internet also controls the platform that defines what ad blockers are allowed to do.

For users who care about thorough ad and tracker blocking, the practical answer has not changed in a year: Firefox or Brave give you what Chrome no longer does. The August 31 deadline just makes the departure permanent.

Sources: Google Chrome Developers, Android Authority