This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

How to change default font weight?

  • 2 replies
  • 2 have this problem
  • 32 views
  • Last reply by cor-el

more options

I want to set the default Serif, Sans-serif, and Monospace fonts to "Medium" weight of IBM Plex Fonts.

The Medium variant is installed, however I can only select the regular font through the Preference menu.

How can I select the Medium variant of the font for serif, sans-serif and monospace?

I want to set the default Serif, Sans-serif, and Monospace fonts to "Medium" weight of IBM Plex Fonts. The Medium variant is installed, however I can only select the regular font through the Preference menu. How can I select the Medium variant of the font for serif, sans-serif and monospace?

All Replies (2)

more options

What the Browser provides is what it can only do anything else beyond that is custom fonts that are installed by another software or you have to use something like userChrome.css to make those modifications. The only other thing that can change fonts is the O/S itself.

more options

You can only select a font-family that way. You would have to use CSS rules to select a specific variant. For the user interface these rules would be in userChrome.css and for websites in userContent.css.