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Google Chrome change that weakens ad blockers begins June 3rd
(www.bleepingcomputer.com)
This is a most excellent place for technology news and articles.
Yes. In the article it links to a blog post made by chromium.
https://blog.chromium.org/2024/05/manifest-v2-phase-out-begins.html
Browsers based on chromium do not have to follow exactly what the main branch is doing. If they want to keep supporting MV2 or support different rules for MV3, they can. Albeit it's a bit cumbersome.