Affected versions

• 81.0a1(20200816214203)

Affected platforms

• macOS 10.15.6
• Ubuntu 18.04

Steps to reproduce

1. Launch FF.
2. Trigger the new modal UI.
3. In the drop-down , select Print to PDF.
4. Print.

Expected result

• Page is successfully printed to PDF.

Actual result

• A blank .txt file is generated and at the same time, an actual print is performed on the printer.

Suggested Severity

• I would consider this issue an S1 seeing as how no PDF is generated and actual papers are being printed.

Regression range

• Not a regression

Other notes

• Screen cast of the issue: https://drive.google.com/file/d/1nG2DuXzFeuqmUoqJTseeFeRGt7u2un5z/view?usp=sharing

I'm not sure if we expected this to work, but when I tried it, it gave me the same results… 😂

You need to set:

settings.printToFile = true;
settings.outputFormat = nsIPrintSettings.kOutputFormatPDF;

around here:

https://searchfox.org/mozilla-central/rev/2f9eacd9d3d995c937b4251a5557d95d494c9be1/toolkit/components/printing/content/print.js#97

outputFormat is set again in PrintingChild.jsm [1] since I didn't see a flag to save it to prefs. When the save to PDF printer is selected we set the outputFormat [2] on the settings object which gets passed through to the Printing:Child:Enter call [3].

If this is on macOS what I see there is that the print always goes to the default printer. If I select Save to PDF or a printer that isn't on my current network the print still goes to my printer I last printed to.

We aren't setting printToFile, I can add that but this currently works on Windows and there seems to be some other underlying issue on macOS.

[1] https://searchfox.org/mozilla-central/rev/2f9eacd9d3d995c937b4251a5557d95d494c9be1/toolkit/actors/PrintingChild.jsm#327-329
[2] https://searchfox.org/mozilla-central/rev/2f9eacd9d3d995c937b4251a5557d95d494c9be1/toolkit/components/printing/content/print.js#322
[3] https://searchfox.org/mozilla-central/rev/2f9eacd9d3d995c937b4251a5557d95d494c9be1/toolkit/components/printing/content/printUtils.js#229

https://hg.mozilla.org/mozilla-central/rev/80bf9501df99

Verified fixed with the latest builds, Fx 82.0a1 (2020-08-25) and Fx 81.0b2 on macOS 10.15 and Ubuntu 20.04

https://testrail.stage.mozaws.net/index.php?/cases/view/1084726