Bug 495864

Summary:	Scalling does not affect Firefox's "layout.css.devPixelsPerPx"
Product:	[Plasma] kwin	Reporter:	Fernando M. Muniz <fernandommuniz>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	nate
Priority:	NOR
Version First Reported In:	6.2.3
Target Milestone:	---
Platform:	Arch Linux
OS:	Other
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	1.25 was the default value, but my screen scalling was 100%, instead of 125%

Description Fernando M. Muniz 2024-11-06 04:53:02 UTC

Created attachment 175569 [details]
1.25 was the default value, but my screen scalling was 100%, instead of 125%

By default, Firefox installed with pacman has "1.25" value in "about:config" → "layout.css.devPixelsPerPx".
After changing the default screen scalling from 125% into 100%, Firefox's didn't change its 1.25 value.
"1.25" is not supposed to be the default value:
https://support.mozilla.org/mk/questions/1378420

Is there a way of making Firefox scalling always match the system scalling?

Comment 1 Nate Graham 2024-11-06 05:48:15 UTC

Probably, but this is something that Firefox itself would have to do. The fact that it correctly finds the default value indicates that it's capable of this, but apparently it doesn't track it if it changes.