File:Extension Firefox.png - Wikimedia Commons

Theme Font & Size Changer – Get this Extension for 🦊 Firefox (en-US)

Best fonts for different sizes, Firefox Support Forum

css - Texts without sub-pixel rendering in Firefox and its variants (Librewolf, Tor, etc) look blurry in LCD monitors - Super User

How to set bigger default font size for firefox? - Community - SitePoint Forums

GitHub - M-Reimer/togglefonts: Firefox Addon to toggle website fonts

My first Firefox extension

How to set bigger default font size for firefox? - The freeCodeCamp Forum

How to add an Extension button to the Firefox toolbar

Firefox Extension

Font Inspector (WebExtension) – Get this Extension for 🦊 Firefox (en-US)