Firefox has been decoupled from the system certificate store since the
nss p11-kit integration in combination with our cacert package does not
expose CKA_NSS_MOZILLA_CA_POLICY, which among other things is required
for addon updates.
(cherry picked from commit 2d4ed9bae6f9c80d75cf5ef18ccdac85cf889ff3)
This test was failing because Firefox was displaying a download prompt
rather than the page content, presumably because mumble mumble
content-type sniffing.
By explicitly setting a content-type, the test now passes.
Martin Weinelt
Maximilian Bosch
Luke Granger-Brown
rnhmjoj