Microsoft Edge Starts Phasing Out Manifest V2: What Happens to uBlock Origin

Microsoft Edge is beginning a phased transition away from Manifest V2 extensions. Some users will see warnings starting in August 2026, and the browser will gradually turn affected extensions off by default over the following months. This matters to the classic Edge edition of uBlock Origin because it uses Manifest V2.

uBlock Origin did not stop working on every computer on August 8, however. Microsoft has not published one cutoff date for Stable, a particular extension, or an individual device. The process begins with notices and preview channels before reaching users gradually.

What Microsoft actually announced

Under Microsoft’s August 7 plan, the first notices will appear on edge://extensions and Microsoft Edge Add-ons product pages. Only a subset of people with MV2 extensions installed will see them at first.

The next stage is a gradual process of turning MV2 extensions off by default. Microsoft says users will receive advance notice and be directed to a recommended MV3 edition where one is available. The company has not said which extension it will recommend to uBlock Origin users or whether it will provide a dedicated settings-migration path.

Stage	What to expect
From August 2026	Warnings for a subset of MV2 users on edge://extensions and in Edge Add-ons
Following months	MV2 extensions gradually turned off by default
Channel order	Canary, Dev and Beta first, followed by a gradual expansion to Stable
Consumer target	Microsoft aims to complete the transition by the end of 2026
Managed work devices	Excluded from the consumer phase; enterprise deprecation is expected to begin in early 2027

“By the end of 2026” is a stated goal rather than a guaranteed cutoff for every installation. Microsoft also has not specified an Edge version, a rollout percentage, or how long a disabled extension might remain manually re-enableable.

Why this affects uBlock Origin

A manifest determines which browser capabilities an extension can use. Under MV2, a content blocker can programmatically evaluate network requests while a page loads. MV3 moves much of that decision-making into declarative rules that the extension defines in advance and the browser enforces. Microsoft presents the transition as an improvement to security, privacy and performance.

The official Chromium manifest for classic uBlock Origin still declares Manifest V2. The full Edge edition therefore falls within the class of extensions covered by Microsoft’s transition. This is an inference from the extension’s own specification and Microsoft’s general plan: the announcement did not name uBlock Origin separately or give it a dedicated cutoff date.

As of August 8, Edge Add-ons separately lists uBlock Origin and uBlock Origin Lite. Lite is maintained by the same developer for Manifest V3, but it is a separate extension rather than a routine update to the full edition.

uBlock Origin and uBlock Origin Lite are not identical

Feature	uBlock Origin	uBlock Origin Lite
Platform in Chromium/Edge	Manifest V2	Manifest V3
Filtering model	Full extension filtering engine	Primarily declarative rules enforced by the browser
Advanced capabilities	Broader control and more rule types	Some MV2 capabilities cannot be reproduced completely
Cosmetic filtering	Generic cosmetic filters work by default	Generic cosmetic filtering requires Complete mode
Installation	Existing MV2 extension	Separate MV3 extension

The developer explains in the uBlock Origin Lite FAQ that some people may not notice a difference at all; the result depends on the websites and configuration. Lite is not a full port of uBO, though. Some filters cannot be converted into MV3 rules, so uBOL can be less effective on sites that detect content blockers or in certain cases where filtering causes page breakage.

Comparisons from two years ago are no longer complete: Lite gained custom filters and subscriptions to external lists in June 2026. Even after that change, its developer describes it as a lightweight, declarative blocker for install-and-forget use rather than an exact copy of uBO.

What Edge users should check

1. Open edge://extensions. If uBlock Origin is enabled and no warning appears, it can continue working for now. There is no need to remove it solely because of the announcement.
2. Back up custom settings. If you added filters or rules, export a copy. Do not assume every part of the configuration will transfer automatically to Lite.
3. Install Lite only from its official Edge Add-ons listing. Check the exact name and developer so that you do not install an unrelated copy with a similar icon.
4. Do not run two content blockers together. Disable another blocker before testing uBOL because the extensions can interfere with one another.
5. Test the websites you actually use. Visit video services, news pages and sites with anti-blocker notices. That is the most useful way to learn whether Lite is sufficient for your setup.
6. Try Complete mode when necessary. It enables generic cosmetic filtering, but the extension will need broader permissions on the selected sites.
7. Do not change enterprise policy on your own. Managed devices are excluded from the consumer phase, and the organization’s administrator should decide how to migrate them.

Do you need to switch browsers

uBlock Origin Lite may be sufficient for routine blocking of ads and trackers. If you depend on dynamic filtering, complex custom rules or other advanced uBO capabilities, test Lite before Edge disables MV2 on your installation.

Another option is a browser where the full extension remains available. For example, uBlock Origin in Firefox Add-ons continues to receive updates. That does not mean every Edge user should immediately switch; the decision depends on which blocking features you need.

Is Microsoft banning ad blockers

No. Microsoft is changing the extensions platform, while Manifest V3 content blockers remain available in Edge Add-ons. The company says 95% of the top MV2 extensions already have MV3 editions. That ecosystem-wide figure does not prove that every new edition reproduces every feature of its predecessor.

The practical conclusion: classic uBlock Origin did not stop working for every Edge user today, but its MV2 edition no longer has a long-term future in this browser. Watch edge://extensions, avoid unofficial copies, and test whether the official uBlock Origin Lite meets your needs before the rollout reaches your device.