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ReFont

Change the font on any website to one installed on your computer or hosted on the web. Allocate fonts to specific websites and URLs whilst keeping a global font for all pages. Easily add more fonts through the ReFont manager. Supports most font types.

Please note that due to WebExtensions restrictions, the font on system pages or addons.mozilla.org can not be changed.

Install
ReFont menu. Google Fonts. ReFont font library manager.