Here is the desired handlers.json file. Because you see no problems on a fresh installed machine, I try again on my fresh installed machine and I have some new information.
When using an external link (https:///... /file.pdf") firefox asks as desired. When I use a local file resource (from bookmark for example file:///.../file.pdf) firefox does not ask and opens it with the internal viewer. On recent Ubuntu version (16.04, 18.04) firefox also asks for local file resources. ** Attachment added: "handlers.json" https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1908049/+attachment/5443779/+files/handlers.json -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1908049 Title: Firefox cannot open pdf with viewer (evince) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1908049/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
