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Re:Firefox 80 by mapgrep on Tuesday August 25, 2020 @01:20PM (#24273668)
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-Ques...

https://en.wikipedia.org/wiki/PDF.js

Re:Firefox 80 by muxator on Tuesday August 25, 2020 @04:06PM (#24275513)
It started as an experimental extension and was integrated once it was deemed stable. That was a long time ago, anyway (~8 years, probably more).