FreeStylerWs is described as 'Styles and skins for all popular sites in the web' and is an app in the Web Browsers category. There are more than 10 alternatives to FreeStylerWs for a variety of platforms, including Online / Web-based, Google Chrome, Mac, Windows and Linux. The best alternative is Dark Reader, which is both free and Open Source. Other great apps like FreeStylerWs are Stylus (Free, Open Source), Greasemonkey (Free, Open Source), Tampermonkey (Free Personal) and Violentmonkey (Free, Open Source).
This eye-care extension enables night mode creating dark themes for websites on the fly. Dark Reader inverts bright colors making them high contrast and easy to read at night. You can adjust brightness, contrast, sepia filter, dark mode, font settings and ignore-list.
Greasemonkey is a Firefox extension that allows you to customize the way webpages look and function. Hundreds of scripts are already available for free. And if youre the tinkerer sort, you can also write your own.
Make visual changes to any website with CSS and see changes in real time. Sync, edit, and export your custom style sheets. - Customize websites with CSS by creating your own user style sheets. Customize page appearance, fix rendering bugs, make the web what you want it to be.