Source Sans Pro 4 does not render correctly in Firefox 1.1.1 for Windows and Android · Issue #6138 · google/fonts · GitHub

Fonts not looking good on Firefox, Firefox Support Forum

Next Google Font: Source Sans Pro not looking like it should · vercel next.js · Discussion #49688 · GitHub

Fonts not looking good on Firefox, Firefox Support Forum

Font name changed from Source Sans Pro to Source Sans 3 / Source Serif Pro to Source Serif 4 · Issue #233 · adobe-fonts/source-sans · GitHub

css - Google Font not working on Safari - Stack Overflow

Source Sans Pro 4 does not render correctly in Firefox 1.1.1 for Windows and Android · Issue #6138 · google/fonts · GitHub

10.10 - Font rendering in Firefox is blurry - Ask Ubuntu

Issue loading the site in Firefox Nightly (57) · Issue #1135 · google/fonts · GitHub

Unable to render font family · Issue #14330 · mozilla/pdf.js · GitHub

Releases · adobe-fonts/source-sans