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verifySignedTx compared only from, to, value and data, so a signed transaction could differ from the approval in chain id, nonce, gas limit or any fee field and still be broadcast. It now compares every consequential field and refuses outright on any mismatch: the chain id against the selected network (and against the approval when the page fixed one), plus nonce, gas limit, gasPrice, maxFeePerGas and maxPriorityFeePerGas wherever the approval carries a value, together with the fee mechanism the approval implies. Fields the approval does not carry are populated locally by the popup and have no approved value to compare against, so they are held to absolute ceilings instead. A failed signing attempt also left a button that could not succeed: the background deleted the approval before it broadcast, so a retry found nothing to sign. The approval is now retired only once the request has an outcome, and the background tells the popup whether the failure is retryable, so the button comes back for a failure the user can correct and stays down with an explanation when the approval is spent.