I was under the impression Firefox used PDF.js -- javascript rendering of PDFs -- as its native PDF viewer. I could be very wrong. But if so, would explain the

I was under the impression Firefox used PDF.js -- javascript rendering of PDFs -- as its native PDF viewer. I could be very wrong. But if so, would explain the performance issues. PDF.js is known to be built into Firefox, I cannot think of why it would be, other than for the purpose of functioning as the core pdf viewer. But I am not that imaginative! https://github.com/mozilla/pdf.js/wiki/Frequently-Asked-Questions https://github.com/mozilla/pdf.js/wiki/Frequently-Asked-Ques... https://en.wikipedia.org/wiki/PDF.js https://en.wikipedia.org/wiki/PDF.js