“This Extension May Soon No Longer Be Supported” Explained

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A user-friendly explanation of Google Chrome's Manifest V3 update

Co-authored by Travis Boylls Reviewed by Stan Kats

Last Updated: February 9, 2025 Fact Checked

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Message Meaning

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Manifest Definition

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Manifest V2 vs. V3

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Why Ad Blockers are Affected

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Why Manifest V2 is Depreciated

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What to Do

If you have been using Google Chrome in the last few months, you may have noticed a message "This extension may no longer be supported" when using various browser extensions, particularly ad-blocker extensions. What does this mean? Why is this happening? Is there anything you can do? This wikiHow article answers all your questions and more.

What "This Extension May No Longer Be Supported" Means

Google Chrome has phased out support for Manifest V2 in favor of Manifest V3. Any Google Chrome extension built on Manifest V2 is no longer supported. Try looking for an alternate extension or using a different web browser, such as Firefox or Opera.

Section 1 of 6:

What does this message mean?

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All Google Chrome extensions need to use the Manifest V3 framework to be supported on the Chrome Web Store. Manifest V3 has more limited rules that web browser extensions need to follow. Ad blocker extensions are most likely to be affected by this change.^{[1]
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Section 2 of 6:

What is Manifest?

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They are required files for all web browser extensions. They contain information that explains the structure and behavior of the extensions. Manifest files have to follow certain guidelines set by the browser manufacturer (i.e. Google). As technology evolves, the guidelines change to meet new standards and security concerns. All Chrome extensions now have to follow the guidelines set out in the Manifest V3.^{[2]
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Section 3 of 6:

What is the difference between Manifest V2 & V3?

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Manifest V3 now uses service workers to perform background tasks, which helps improve efficiency. There are also numerous security improvements. Web extensions no longer have broad access to permissions or web request APIs This improves security but limits what web extensions are allowed to do.^{[3]
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Section 4 of 6:

Why are ad blockers affected by Manifest V3?

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Ad blockers generally work by monitoring API requests from the user to the website. They then have a set of rules that intercept the request and replace it with something different. Manifest V3 requires the extension to declare the rules by which the browser should respond upfront. This gives the browser control over what can be blocked rather than the extension.^{[4]
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Section 5 of 6:

Why has Google depreciated Manifest V2?

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The broad permissions that are allowed under Manifest V2 allow extensions to misuse user data. In recent years, Google has gotten some bad press for all the malware and spyware in the Chrome Web Store. They want to take more control over what browser extensions are allowed to do. There are also a number of changes that are designed to improve the performance of a web browser extension.

Section 6 of 6:

What can I do if an extension is no longer supported?

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There is a couple of things you can do if an extension is no longer supported. They are as follows:
- Find an alternate extension. Many ad blockers and other V2 extensions have developed V3 versions of their extensions. For example, uBlock Origin is recommending you switch to uBlock Lite.^{[5]
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  Research source} AdGuard has also developed a Manifest V3 version of their extension.^{[6]
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  Research source} It should be noted that these manifest V3 versions of popular ad blockers are still in their experimental beta testing phase and may not work as well as the previous Manifest v2 versions.
- Switch to another web browser. If there is a particular web browser extension that you need that uses Manifest V2, you may want to consider switching to another primary web browser. Firefox still supports Manifest V2 and has stated that they currently have no plans to depreciate Manifest V2 web browser extensions.^{[7]
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  Research source} Opera has also stated that they plan to continue support for Manifest V2 extensions independently of the changes to Chromium.^{[8]
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  Research source} Brave Web Browser plans to continue support for certain V2 extensions, particularly ad blockers like uBlock Origin, AdGuard, uMatrix, and NoScript.^{[9]
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