Fuentes más oscuras (Dark Fonts) is a Chrome extension that focuses on enhancing the appearance of text on webpages. When viewing a webpage on a Windows browser, the text often appears less clear and crisp compared to other operating systems like MacOS.

This is because Windows browsers use a rendering technique called "standard sub-pixel rendering," which does not produce as high-quality display as other techniques. Fuentes más oscuras addresses this issue by applying an antialiasing effect to the text using CSS3 properties. This makes the text appear clearer and crisper, making it easier and more comfortable to read.