1425725 - Firefox 58 incorrectly scales fonts on chrome with HiDPI monitor and Linux

Status: UNCONFIRMED

(Core :: Graphics: Text, defect, P3)

Description

[unera]

Attachment: firefox-hidpi.png

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0
Build ID: 20171119034643

Steps to reproduce:

I have a HiDPI display (15'', 2880x1800), Linux Debian. I used Firefox ESR (45), it showed menu/tabs properly.

For firefox 45 I changed about:config://layout.css.devPixelsPerPx to 1.5.

Today I upgraded my firefox to 58.0b4:

1. I removed my ~/.mozilla directory
2. I reset option about:config://layout.css.devPixelsPerPx to 1.5 value

Sites are showed properly, but all firefox internal controls (menu, tabs, context menu, etc) ignore the option and have too small font (addressbar has font ~ 1mm, etc).

So it is unusable.

I googled, but did not find any workarounds.

Could You explain me how to use FF58 on HiDPI monitors?

Comment 1

[unera]

- Doctor, I'm ignored!
- Next patient, please!

Comment 3

[unera]

> Duplicate of this bug: 1428931

My problem is fontsize problem, not "scrollbar problem"

On HiDPI monitors Firefox 58+ showes its own texts (addressbar, menu, etc) with fontsize < 1mm (absolute value), so it is unreadable/unusable.

Scrollbars - is the other problem.

Comment 4

[Jim Mathies [:jimm]]

Have you tried using a value of 1 for layout.css.devPixelsPerPx?

Comment 5

[unera]

> Have you tried using a value of 1 for layout.css.devPixelsPerPx?

Of cource! 1, 1.5, 1.8, 2, 3...

the option changes only web-content, not FF controls,
so web pages are showed properly, but addressbar, text at tabs, context menu, menu, etc are showed with fontsize < 1mm (absolute value).

FF45 worked properly, FF58+ - don't.