1879407 - Can't use non-built-in fonts as default font - results in visibility level error

Status: RESOLVED INCOMPLETE

(Core :: Layout: Text and Fonts, defect)

Description

[u743091]

Attachment: screenshot.png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:122.0) Gecko/20100101 Firefox/122.0

Steps to reproduce:

Install a custom font first. Then:

• Go to about:preferences
• Search for "font"
• Change the default font to anything that doesn't come with Windows (eg. the font you set earlier)

Actual results:

It uses Arial or Segoe UI instead, with this message appearing in the log:
"Request for font "Font Name" blocked at visibility level 2 (requires 3). utils.js:107:48"

For some reason, fonts that are included with Windows work as intended.

Expected results:

Firefox should have used the set font as its default font for websites, regardless of whether it comes with Windows or not. It worked like this up until a few months ago.

Comment 1

[Robert Longson [:longsonr]]

Are you using private browsing. This is a deliberate anti-fingerprinting measure if so. You can override it by setting font.system.whitelist per https://security.stackexchange.com/a/195890

Comment 2

[BugBot [:suhaib / :marco]]

The severity field is not set for this bug.
:lsalzman, could you have a look please?

For more information, please visit BugBot documentation.

Comment 3

[Daniel Holbert [:dholbert]]

Looks like the reporter's account was disabled. Can't proceed here without more information (depending on the setup, the described behavior may be things working-as-intended, per comment 1).

--> resolving as "incomplete"