Instantly changes the font family, font size, font color, font style and background color of the main interface for Pale Moon and other Mozilla-like applications. Fork of the extension Theme Font & Size Changer by Baris Derin.
Simply download the contents of the "src" folder and pack the contents into a .zip file. Then, rename the file to .xpi and drag into the browser.
You can grab the latest release either from the Releases section of this repository, or the Pale Moon Add-Ons Site.