"Chrome retires Manifest V2 for good — and the ad-blocking world just adapted again"

Google's long-running migration to Manifest V3 has finally hit its end state: every remaining Manifest V2 extension has now been removed from the Chrome Web Store, including uBlock Origin, the most widely used content blocker on the web. It's the closing chapter of a transition that began in 2019, and while the headline sounds dramatic, the mechanics are fairly mundane — affected extensions simply stop receiving updates and can no longer be installed or reinstalled from the store, though existing installations on Chrome 138 or earlier keep working for now (the full rundown is at Web Iterate).

The interesting part isn't that uBlock Origin left the store; it's why the change happened in the first place. Manifest V3 replaced the webRequest API that extensions like uBlock Origin used to inspect and block network requests in real time with a declarative filtering system that hands the blocking logic to the browser itself. The stated rationale is security and performance — legacy extensions could see every request you made and hold up page loads while they processed it, which is genuinely a privacy and speed problem when abused by the wrong extension. But it also hard-caps how many rules a blocker can enforce, which is why ad blockers have been the loudest critics of the move. Whether you read it as a security win or a quiet effort to protect ad revenue, the architectural shift is real and it's now complete.

The consequence everyone should actually pay attention to is the ecosystem one. The Chrome Web Store isn't just Chrome's store — it's the default marketplace for essentially every Chromium-based browser, from Brave and Edge to Opera and Vivaldi. So when Google removes an extension there, it disappears from those browsers too, even when the underlying browser still technically supports Manifest V2. That's a subtle but meaningful illustration of how much leverage a single storefront holds over software it doesn't directly control. Browsers that want to keep MV2 alive can still do it — but only by maintaining their own store or leaning on sideloading, which is a real differentiation opportunity that most of them, so far, haven't taken.

The encouraging throughline is that blocking didn't die, it adapted. The developer behind uBlock Origin shipped uBlock Origin Lite — a Manifest V3-native version that does most of the same job with fewer features — and Mozilla has committed to keeping Manifest V2 fully supported in Firefox for the foreseeable future. If anything, the whole episode is a useful reminder that the web's open architecture has always had an escape valve: when one vendor narrows what extensions can do, the capability doesn't vanish, it just relocates to wherever it's still welcome.