1696758 - Selection screenshot truncated with devicePixelRatio != 1 and resistFingerprinting

Status: RESOLVED DUPLICATE of bug 1699410

(Firefox :: Screenshots, defect)

Description

[jscher2000]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0

Steps to reproduce:

Setup:

(1) Set privacy.resistFingerprinting to true
(2) Open a page and make sure the devicePixelRatio is greater than 1, either due to Firefox using system scaling greater than 100% or by using page zoom.

Start capturing a screenshot and either click to select a node or drag to select an area, then click Copy.

Paste into an image Editor.

Actual results:

Captured rectangle is truncated because it is sized for devicePixelRatio = 1

Per mozRegression, this is a regression from bug 1664444

Expected results:

Captured rectangle should reflect the correct devicePixelRatio (despite resistFingerprinting)

Comment 1

[Tom Ritter [:tjr] (OOTO until 4/30 at least)]

Thanks for the report, you are correct. We don't have a timeline for when this will be fixed, but it should be fixed by Bug 1450398.

Comment 2

[Emma Malysz]

Thanks for reporting! Given that the fingerprinting functionality would be fixed in Bug 1450398 and the zoom scaling is being addressed in 1699410, I'm going to resolve this a dupe