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Users on Reddit and other platforms have been complaining that the uBlock Origin extension, which blocks ads, has stopped working on Google Chrome. This is due to the end of support for older extensions in the browser, which directly affects the popular ad blocker.
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Below, we explain the following points:
- Why did uBlock Origin stop working?
- What are the advantages of Manifest V3?
- Alternatives to the end of support
Why did uBlock Origin stop working?
The uBlock Origin is developed with the Manifest V2 structure, a set of APIs necessary for creating extensions for major browsers. However, Google has decided to end support for V2 starting in 2024 and favor the newer Manifest V3.
This means that all extensions built with Manifest V2 will become obsolete and stop working on Chrome and other Chromium-based browsers (such as Edge and Opera). Google started disabling these extensions in June last year, and it’s expected that all will be removed by mid-year.
Even though some users still have access to uBlock Origin (or any other extension made with Manifest V2), support is expected to end in the coming months.
The ad blocker’s page on the Chrome Web Store no longer allows downloading the tool, stating that it’s no longer available “because it doesn’t follow Chrome’s recommended practices for extensions.”

What are the advantages of Manifest V3?
The Chrome development team considers Manifest V3 a more secure generation of APIs for creating extensions in the browser. Compared to its predecessor, V3 allows for generating components with a greater focus on privacy and performance within the app.
The new generation changes the plugin’s structure and requires developers to show the complete code of the tool, which can facilitate the identification of malicious files. Additionally, the new set helps standardize extensions even more between browsers.
However, users who rely on ad blockers may be affected by the change: Manifest V3 limits the action of these tools due to an API called declarativeNetRequest, which increases privacy but reduces the power of ad blockers to modify a web page. Previously, components used the webRequest API to block any unwanted content before loading a site.
Alternatives to the end of support
The developers of uBlock Origin have created uBlock Origin Lite, a lighter version of the tool, but developed with the Manifest V3 standard.
Those who don’t want to lose the extension can migrate to Firefox, as Mozilla has confirmed that it will maintain support for both Manifest V2 and Manifest V3 in the app. According to the initiative behind the browser, “more choices for developers mean more choices and innovation for users.”
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