Some developers are concerned that the changes introduced in Manifest V3 could limit the functionality of their extensions and negatively impact user experience. For example, the deprecation of the chrome.runtime.sendMessage() method for communication between content scripts and background scripts could make it harder to implement certain functionalities, such as real-time communication and message broadcasting.

Additionally, the new restrictions on accessing user data could impact the functionality of certain types of extensions, such as ad blockers, which rely on access to browsing history and other user data to function.

Furthermore, some developers are worried that the changes to the extension architecture could make it more difficult for them to monetize their extensions, as certain types of monetization methods, such as in-extension ads, could be impacted by the new restrictions.

Google has been working with developers to address their concerns and provide them with guidance on how to update their extensions for Manifest V3.
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