hm, I had to install pdf.js myself. I am using trisquel 5.5 in this case. You can download it here: https://addons.mozilla.org/en-US/firefox/addon/pdfjs/
I didn't see a license, but source is available on github, so I didn't worry too much. Would it be possible to add this to the Trisquel Abrowser extensions repository? It is a cool addon! I have been using it since it was beta sotware, but I didnt keep it up to date for a few re-installs. It is good to see that it is out of beta now Thanks for the post aliasbody
