Mozilla performing pdf.js DNS queries?

[Seth Mos <seth.mos () dds nl>]

Hi,

Whilst rummaging through some DNS (dnsmasq) logs I've noticed quite a
decent amount of queries for pdf.js from what appear to be mozilla browsers.

Seems rather odd that it is performing DNS queries for a internal PDF
viewer.

Has anyone else come across these lookups?

Kind regards,

Seth