How can this be firefox default pdf reader ?!? Rated 1 out of 5 stars

Almost every .pdf can't be loaded, and this application only suggests you to open your file with another pdf viewer. And if "pdfjs" can read your file, you'll have to wait for a while until it displays.Fortunately, by reading the comments here, I found out how to disable it and use another viewer.

This review is for a previous version of the add-on (