PrintApplet should never directly call something outside of the sandbox. This function needs to be invoked as a privileged function, preferably asynchronous and queued.
Closing, this bug exists solely on a non-maintained branch (master). https://github.com/qzind/qz-print has the latest (1.9 at the time of writing this).
2.0.0 branch only.
Offending code is here: https://github.com/qzindustries/qz-print/blob/master/qz-print/src/qz/PrintApplet.java#L381
PrintApplet should never directly call something outside of the sandbox. This function needs to be invoked as a privileged function, preferably asynchronous and queued.