Note
I may have some settings on my MacBook, because this issue only reproduces on my machine.

Affected versions

• Fx 86.0b6
• Fx 87.0a1

Affected platforms

• macOS 10.15
• macOS 11.2

Steps to reproduce

1. Open Firefox.
2. Open a new tab and access the following link
3. Open the new print modal (print.tab_modal.enabled = true)
4. Select a custom page selection.
5. Save to *.pdf.

Expected result

• The print preview is displayed correctly and save to pdf as in print preview.

Actual result

• The print preview is displayed correctly but the pdf file contain wrong unicode characters.

Regression range

• I will come back with regression range ASAP.

Additional notes

• Setting the pref: gfx.downloadable_fonts.enabled to false the *.pdf file is saved correctly.

I've investigated this issue on macOS 10.15 and on macOS 11.2 in order to find a regression range, and it seems that the bug reproduces all the way back to Fx 67.0a1 (2019.02.25) on my station only. I must mention that after the investigation I noticed that the *.pdf file was saved correctly, because it opens correctly with chrome, but not with Firefox.

Tested with Firefox 91.0b5 and latest 92.0a1 Nightly on macOS 10.15 and it seems that the issue is no longer reproducing.