Affected versions

• 83.0a1 (2020-10-12)

Affected platforms

• Ubuntu 18.04

Steps to reproduce

1. Launch Fx
2. Make sure print.tab-modal.enabled is set on true
3. Go to https://www.reddit.com/ or https://www.instagram.com/
4. Select an image
5. Choose Print Selection from context menu
6. Observe the print preview

Expected result

• The image selection is reflected in Print preview

Actual result

• Images are not displayed at all or are broken

Regression range

• Not a regression

Additional notes

• On chrome the image selection on the same websites are working
• Websites like Pinterest or Cnn are not affected

Suggested severity

• S3

:Anca, if you think that's a regression, then could you try to find a regression range in using for example mozregression?

I can reproduce this on reddit.com, on linux/ubuntu. If you select an image with very little else, the print preview shows just a stripe of the image. Selecting more content below the image seems to work fine.

I haven't been able to reproduce on reddit, and I don't have an instagram account... Is there any chance anyone can attach something that repros the issue?

This probably is about how the DOM ends up after the selection and such...