On Linux, you can install the font file to your system, and it should pop up as an option in Firefox. There's a bazillion different font websites, you'll be able to find what you're looking for as long as it's not some super proprietary font only used for some company's products. It should be similar with Windows, not sure about MacOS since I have no experience with it.
this post was submitted on 14 Jun 2026
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Oh, I didn't even realize that it was probably just not on the machine at all, regardless of the browser, haha. Thanks, I'll poke around...
Yeah as adarza (can't figure out how to copy a users instance URL in interstellar) said it's a Microsoft font, so unless you're running windows it's most likely not preinstalled.
that font is one that's bundled with windows since vista, part of the 'microsoft cleartype font collection'. afaik it's not a free or foss font. but that should give you enough to ask your favorite search engine for uh.. "more information". if manually downloaded, they'd install like any other into macos or linux.
if you have the font (or have windows), and just want to change the default font for firefox, it's in the general settings, about halfway down that page. but note that web sites can change the fonts used on them, including downloading fonts for use on the page (those don't "install" into your os) via scripts or css.