What is Manifest Version 3?
Manifest Version 3 (MV3) is the current extension standard for Chromium-based browsers including Google Chrome and Microsoft Edge. Google enforced MV3 for all extensions in 2024. Firefox supports both MV3 and MV2.
How does MV3 affect AdBlocker Ultimate?
AdBlocker Ultimate fully supports MV3 and continues to block ads and protect your privacy on all supported browsers. However, MV3 introduces two limitations worth understanding:
Filter update delays: MV3 prevents extensions from downloading filter list updates in real time. Updates must now be bundled inside the extension itself and go through the browser's extension review process. This can mean a delay of 1–5 days before new filtering rules reach you on Chrome or Edge.
Handling complex scenarios: Some websites use rapidly changing or sophisticated techniques to circumvent ad blockers. MV3's stricter limits make it harder for browser extensions to respond to these in real time.
What this means for you
For most everyday browsing, you will not notice a difference. AdBlocker Ultimate continues to block the vast majority of ads effectively under MV3.
If you encounter a site where ads are not being blocked, it may be because the site has recently changed its ad-delivery code and the filter update has not yet been pushed through the extension review process.
What you can do
Option 1 — Use AdBlocker Ultimate for Windows or macOS
The desktop applications are not subject to MV3 restrictions. They receive filter updates directly and handle complex anti-adblock scenarios that browser extensions cannot. Download for Windows or Download for Mac.
Option 2 — Use Firefox
Firefox continues to support Manifest Version 2, which allows real-time filter updates without the delays imposed by MV3. Get AdBlocker Ultimate for Firefox.