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From last few version Firefox natively have integration of Pdf.js. Sometime you (maybe) feel that it’s run very slow. very slow to scroll down the PDF. Now you want to disable it.

How you can do it.

Here is the settings


In my system I have installed Adobe Reader. First option is going to open the file in Adobe reader and second (that I selected) is about to open in firefox itself. Now Slow performed pdf.js problem is gone