3 ms·I really like Firefox's built in PDF viewer. It even shows the table of contents where available.by bootlooped 6y agoI really like Firefox's built in PDF viewer. It even shows the table of contents where available.hnick 6y agoYes it's pretty good. I actually used PDF.js to debug a malformed issue at work once. The javascript console error log gave a clue about the issue where no other tools said anything.kccqzy 6y agoSo does Preview. So does Acrobat Reader.