On Zesty the PDF's you describe in comment 1 open in Firefox's built-in PDF viewer. If you don't want that to occur go to about:config and set pdfjs.disabled to true.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1336366 Title: In Firefox, pdf files do not open To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1336366/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
