Hi @David Buyer ,
Based on my search, you could refer to the Manifest V2 support timeline for Chrome extensions for planning your extension's migration. I thought it should be similar to the Edge browser.
The doc above indicates that the Manifest V2 will be disabled as early as June 2024.
Also, I recommend you send feedback on this issue by pressing Alt+Shift+I in Microsoft Edge.
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Best Regards,
Raina Zhao