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Given that the event listener is registered on the document, there could in *theory* be more than one of these listeners present at any one time. In practice this doesn't currently happen, since all of the `actions` invoked in [`PdfStreamConverter.jsm`](https://searchfox.org/mozilla-central/rev/bfbacfb6a4efd98247e83d3305e912ca4f7e106a/toolkit/components/pdfjs/content/PdfStreamConverter.jsm#933-952) are *synchronous* methods. However, there's no guarantee that this will always be the case, and it's easy enough to prevent any future issues here by simply registering the "pdf.js.response" event listener on the `Text` node instead. This works since, as can be seen in [`PdfStreamConverter.jsm`](https://searchfox.org/mozilla-central/rev/bfbacfb6a4efd98247e83d3305e912ca4f7e106a/toolkit/components/pdfjs/content/PdfStreamConverter.jsm#919,943), the event is dispatched on the element itself rather than the document.