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Manifest V3 Updates
(blog.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
That is the Chrome implementation; Firefox doesn't and won't impose those limits.
As per the MV3 Specification, it is supposed to remove some APIs.
Firefox included them anyways cuz they're not assholes.
I think there's multiple specifications at this point. There's Chrome describing what they're doing unilaterally, and then there's the WebExtension working group that's trying to get alignment among several browsers.