Affected versions

• 80.0a1 (2020-07-13)
• 79.0b7
• 78.0.2

Affected platforms

• Windows 10x64
• Ubuntu 18.04x64

Steps to reproduce

1. Launch FF.
2. Go to cnn.com
3. Click and open any news story.
4. Go to Print from burger menu

Expected result

• Page is correctly displayed in print preview and all of the page's content can be read.

Actual result

• Header of the page is displayed above the text, and above the title of the article

Regression range

• Managed to reproduce this issue with a build from 2019-01-10, will return with a complete regression ASAP.

Notes

• I consider this issue to be an S3, since it is not affecting the overall readability of the page.
• The issue occurs in the same manner when actually printing to paper, regardless of paper size options.

Testing this issue in order to find a regression range, it seems that it's reproducible on every build, verified even on Fx 50.0a1 from 2016.07.23.
This is not a regression, that's why I change the keywords accordingly.