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Re:Firefox is on a slippery slope by crankylinuxuser on Saturday December 16, 2017 @01:29PM (#15940923)
pdf.js seems to work quite nicely.

Seems that's no different than opening with external program, or using a plugin, or using an extension. After all,those things can be updated, whereas the browser should have more core functionality that enable new document types to being opened.

Re:Firefox is on a slippery slope by garaetjjte on Saturday December 16, 2017 @02:15PM (#15941287)
pdf.js performance is horrible, and now without NPAPI it is impossible to view PDF in firefox tab.
Re:Firefox is on a slippery slope by amluto on Saturday December 16, 2017 @06:34PM (#15942917)
PDF.js performs quite well for me and works fine in tabs. It has always been a better experience for me than PDFium, for example.