I like the idea of transitioning from desktop apps to the X extension-only approach. I am, however, super tired of entering my master password to the extension. Please reduce sign-in fatigue by either supporting Windows Hello from the extension directly (like https://docs.microsoft.com/en-us/microsoft-edge/dev-guide/windows-integration/web-authentication) or some other clever approach you come up with. Note that in my case I am already doing max-sensitivity work on my PC, so I am comfortable with tying 1Password decryption to OS security/sign-in (includes disk encryption, TPM, VSM, etc.). I understand that some folks (e.g., shared family PC with single user account) might see "repeated sign-in specifically to 1Password" as a virtue.
As for browser scope, I mainly use the Chromium-based Edge, with a bit of Chrome and Firefox here and there
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