Hi Korwin, the add-on's PDF generator uses the same plumbing as the built-in "Save to PDF" destination on the Print overlay. If the add-on has a problem that doesn't affect the built-in feature, could you contact me at jscher2000@outlook.com or open an issue on https://github.com/jscher2000/printable-print-doctor-extension/issues .

For problems that affect both the add-on and the built-in feature, you could post on Mozilla Support and see whether there is a solution: https://support.mozilla.org/questions/new/desktop/form .