User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0
Firefox for Android

Steps to reproduce:

Environment: Linux, KDE Neon, Firefox 68.0.2, English, Laptop HP
Acts: Open Firefox, open link webpage
"https://bugzilla.mozilla.org/enter_bug.cgi#h=bugForm%7CFirefox"
with title "Enter A Bug - Mozilla Firefox"
on top panel/menu on the window,
Click File->Print->In General tab printer to "Print to File"

Actual results:

In box "File:" we see /tmp/jhkhgkhjh

Expected results:

File: in texbox must be like in Chrome/Chromium/and so on similar browsers:
NOT /tmp/blabla
but
/home/USERNAME/Documents/Enter A Bug - Mozilla Firefox.pdf

Not a security bug that needs to stay hidden.

Hi
i was unable to replicate this. I tested it with ubuntu 18.04 64bit and the latest firefox release 68.0.2
attached is an image of the print to file screen.

please download Firefox Nightly from here: https://nightly.mozilla.org/ and retest the problem.

If you still have the issue please create a new profile, you have the steps here:https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles?redirectlocale=en-US&redirectslug=Managing-profiles#w_starting-the-profile-manager

Lastly test if the issue is reproducible in safe mode, here is a link that can help you:
https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode

Regards

I believe our linux print-to-PDF "File:" box just reuses whatever the last filename you chose (with an initial default of "~/mozilla.pdf").

It indeed would be nicer to generate a name based on the page title. This is tracked in bug 155992.