As web browsers continue evolving their extension platforms, some legacy extensions are at risk of losing compatibility. Google Chrome users who rely on the popular ad blocker uBlock Origin (uBO) have recently seen warnings that the extension may soon be disabled. It is due to the mandated transition from Manifest V2 (MV2) to Manifest V3 (MV3).
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Google Chrome’s Move to Manifest V3
For years, Chrome extensions have relied on the Manifest V2 (MV2) framework to define permissions and functionality. However, Google is now pushing the browser ecosystem toward the new Manifest V3 (MV3) standard. The MV3 platform introduces restrictions that limit extensions’ access to browser APIs for privacy and security reasons.
Manifest V3 Version of Ad Blocker ‘uBlock Origin’
As the lead developer behind uBlock Origin, Raymond Hill has said there are no plans to create an MV3 version. Since uBO remains on MV2, Google Chrome is flagging it as an extension that will lose compatibility. Hill created uBlock Origin Lite (uBOL) as a lighter MV3 alternative, but it has reduced capabilities compared to the original uBO.
Alternative Ad Blockers of uBlock Origin
In Chrome’s warnings about uBlock Origin, Google directs users to “Find alternative” extensions. This links to options like Adblock Plus, Stands AdBlocker, Ghostery, and uBO Lite.
While similar in purpose, these suggested replacements may not offer the same level of ad and tracker blocking as uBlock Origin. Power users preferring uBO’s robust filtering capabilities face losing that functionality.
Phase Out Timeline for MV2 Deprecation
The initial warnings about uBlock Origin inattention were limited to Beta, Dev, and Canary Chrome channels. However, they will gradually expand to more users over the next months. Google’s plan is to carry out the MV2 deprecation in phases:
1. Warnings and Disabling
Chrome will start showing banners about inactive MV2 extensions and eventually disable them, redirecting users to alternatives. However, temporarily re-enabling disabled extensions will still be possible.
2. Removal of Re-enable Option
After some weeks or months, Google will take away the ability to turn extensions back on, forcing users to pick MV3 replacements.
3. Completion by Early 2025
The full transition removing all MV2 extension support is scheduled for completion sitewide in the Chrome browser by the start of 2025.
Extension for Business Users
Google aims to complete the personal user migration by early 2025 but will give businesses more time. Organizations controlling Chrome policy through the ExtensionManifestV2Availability flag can continue using MV2 extensions until June 2025, when the enterprise deprecation rollout begins. After that date, even business extensions face being disabled without MV3 equivalents.
MV3 Impact on Privacy and the Open Web
The mandated loss of compatibility for popular extensions like uBlock Origin concerns some in light of Manifest V3 changes. MV3 imposes new limits on blocking capabilities that could undermine content blocking and privacy protections.
As an open-source project committed to preserving users’ freedom, uBO supporters argue that browser wars should not force people to accept reduced functionality or privacy just to keep using extensions they rely on.
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