Display EC2 instance costs per month#

The EC2 pricing page shows cost per hour, which is pretty much useless. I want cost per month. The following JavaScript, pasted into the browser developer console, modifies the page to show cost-per-month instead.

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Array.from(
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    document.querySelectorAll('td')
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).filter(
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    el => el.textContent.toLowerCase().includes('per hour')
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).forEach(
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    el => el.textContent = '$' + (parseFloat(
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        /\d+\.\d+/.exec(el.textContent)[0]
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    ) * 24 * 30).toFixed(2) + ' per month'
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)