Can a scammer empty my wallet after I disconnect from their website?

The answer

If you granted an on-chain approval or signed a dangerous permission, disconnecting the browser alone may not stop its effect.

What to do next

Revoke relevant token allowances and verify permissions on each used chain. If the private key or seed leaked, transfer remaining assets to new keys.

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Can revoking permissions restore already stolen crypto?

No. Revocation limits future authorised spending but does not reverse final transfers.