Microsoft Edge Is Phasing Out Older Ad Blockers

Microsoft Edge users who rely on older ad blockers and privacy extensions are about to face an important change.

Microsoft announced on August 7 that it is moving ahead with the retirement of Manifest V2, the older browser-extension system used by extensions including the original uBlock Origin.

The change brings Edge closer to Google Chrome, which has already been moving users away from Manifest V2 as the Chromium ecosystem adopts the newer Manifest V3 standard.

Microsoft says the transition is intended to create a more secure, privacy-conscious and better-performing extension platform.

For ordinary Edge users, however, the immediate question is much simpler:

Will your ad blocker still work?

In some cases, the answer will eventually be no.

What Microsoft Announced

Microsoft says it is moving the Edge extension ecosystem toward Manifest V3 and will begin disabling Manifest V2 extensions across its browser channels.

The transition won’t happen to every Edge user overnight.

According to Microsoft’s August 7 announcement, the company will move through the process gradually, beginning with its testing channels before completing the transition for consumers.

Microsoft says the consumer phase-out is targeted for completion by the end of 2026.

Enterprise customers get more time, with Manifest V2 support continuing into early 2027.

That gives users and extension developers a transition period, but the direction is now clear: Manifest V2’s days in Microsoft Edge are numbered.

What Is Manifest V3?

Browser extensions aren’t simply small programs that can do whatever they want inside your browser.

They operate through APIs and permissions defined by the browser’s extension platform.

Manifest V2 has powered Chrome and Chromium-based extensions for years, giving extensions considerable flexibility over how they interact with webpages and network requests.

Manifest V3 changes that architecture.

Google originally introduced MV3 with security, privacy and performance improvements in mind. Microsoft, whose modern Edge browser is built on Chromium, committed to the same general direction several years ago.

Among the changes are tighter controls over what extensions can do and changes to the way they interact with network requests.

Those restrictions can reduce opportunities for malicious extensions to abuse powerful browser APIs.

But they also affect legitimate extensions—particularly sophisticated content blockers.

Browser extensions can also be used to reach restricted content, as explained in TechLoot’s guide covering ways to access blocked websites.

What Happens to uBlock Origin?

This is where the change will become noticeable for many Edge users.

The original uBlock Origin relies on Manifest V2 capabilities.

Once Edge completely disables Manifest V2 extensions, that version of uBlock Origin won’t continue operating normally in the browser.

There is, however, an alternative.

Developer Raymond Hill created uBlock Origin Lite, an extension designed specifically for Manifest V3 browsers.

For users who simply want to block common advertising and trackers, uBlock Origin Lite may provide much of what they’re looking for.

But it isn’t an identical replacement.

The original uBlock Origin offers advanced capabilities and configuration options that cannot simply be reproduced in exactly the same way under Manifest V3.

Power users who maintain custom filters or rely heavily on uBlock Origin’s advanced controls are therefore more likely to notice the transition.

Does Manifest V3 Mean Ad Blockers Are Dead?

No.

This is an important distinction because Manifest V3 is sometimes described online as “the end of ad blockers.”

That’s an exaggeration.

Manifest V3 still supports content-blocking extensions, and numerous ad blockers have already produced MV3-compatible versions.

Research into MV3 ad blockers has also produced more nuanced findings than the claim that the new platform makes effective ad blocking impossible. Modern MV3 blockers can still block substantial amounts of advertising and tracking.

The controversy is primarily about how much control extensions have, not whether blocking is possible at all.

Advanced extensions previously had access to APIs that gave them considerable flexibility in deciding what network requests should be blocked or modified.

Manifest V3 places more of that process under the browser’s control.

For casual users, the difference may be relatively small.

For advanced users, it can be significant.

Users who are concerned about advertising and online tracking can also read TechLoot’s guide to browsing the web anonymously.

Why Microsoft Says It’s Making the Change

Microsoft’s argument largely mirrors Google’s.

Browser extensions are incredibly useful, but their access to webpages and browsing activity also makes them a tempting target for attackers.

A malicious extension can potentially access sensitive information, alter webpages or monitor browsing activity depending on the permissions it receives.

Manifest V3 was designed partly to reduce that attack surface.

Microsoft says the newer platform provides a more secure and performant foundation while giving users greater visibility and control over extension behaviour.

There is evidence supporting the security argument.

Academic research into Manifest V3 has found that changes to extension APIs can eliminate or restrict techniques previously abused by malicious extensions.

However, researchers have also demonstrated that Manifest V3 isn’t immune to abuse.

In other words, the new system can make certain attacks more difficult, but it doesn’t magically make every browser extension safe.

The risks associated with downloading unknown software were also demonstrated by recent fake fixes that secretly installed malware.

How to Check Your Edge Extensions

You don’t need to wait until your favourite extension suddenly stops working.

Edge users can review installed extensions by opening the browser’s Extensions menu and selecting Manage extensions.

Look at the extensions you rely on most frequently, particularly:

• Ad blockers
• Privacy extensions
• Download managers
• Tab-management tools
• Script blockers
• Developer extensions

If an extension is still based on Manifest V2, check whether its developer offers a newer MV3-compatible version.

Microsoft says users will receive notices and migration guidance as the transition progresses.

Avoid downloading unofficial copies of discontinued extensions from random websites. Browser extensions can access extremely sensitive information, making unofficial downloads particularly risky.

Privacy extensions should also be used alongside other suitable privacy and security software rather than being treated as complete protection on their own.

What If You Want to Keep the Full uBlock Origin?

Users who specifically want the original uBlock Origin experience may eventually need to consider another browser.

Mozilla Firefox isn’t built on Chromium and maintains its own extension architecture, meaning Google’s Chromium Manifest V2 retirement doesn’t automatically dictate Firefox’s extension capabilities.

That makes Firefox one of the most obvious alternatives for users who consider the original uBlock Origin essential.

Other browsers may take different approaches to maintaining compatibility with certain extensions, but users should check each browser’s current policies rather than assuming every Chromium-based browser will behave identically.

TechLoot’s comparison of AI browsers in 2026 provides a broader overview of the leading browsers and their privacy implications.

If you’re happy with uBlock Origin Lite or another Manifest V3 blocker, however, there may be little reason to leave Edge purely because of this change.

Edge Users Have Until the End of 2026

The good news is that Microsoft isn’t flipping a switch for every Edge installation today.

The transition is gradual, giving extension developers time to migrate and users time to find alternatives.

But today’s announcement removes much of the uncertainty surrounding Microsoft’s plans.

Manifest V2 is on its way out of Edge.

For most people, the transition may ultimately amount to replacing an old extension with its newer equivalent.

For users who rely on the advanced capabilities of extensions such as uBlock Origin, however, Microsoft’s decision could be enough to make them reconsider which browser they use every day.

Before that deadline arrives, it’s worth checking which of your extensions still depend on the old platform—and what their developers plan to do about it.