Supermium

The Supermium Web Browser (modern web browsing for unsupported operating systems and end-of-life systems).

The browser comes in 32-bit and 64-bit. The Supermium component receives enhancements and improvements from time to time, primarily for operating systems prior to Windows Vista. It is compatible with an up-to-date Chromium-based web browser for Windows XP, 2003, Vista, 7, and 8.x.

The Supermium web browser also provides the following features:

• Aero Glass and Aero Glass-style titlebars instead of Windows 10-style ones (#force-xp-theme in chrome://flags for the latter)
• Turnaround for major vulnerability patches generally less than one week from upstream disclosure
• A functional sandbox for enhanced security
• Google Sync
• On Windows 7 and up, Widevine CDM support for viewing DRM content
• GDI font rendering, using #force-gdi in chrome://flags
• Persistent dark mode on the browser's UI elements, using #force-dark-mode in chrome://flags
• Custom tab options including trapezoidal tabs, transparent tabs, and outlined tabs
• Many flags from ungoogled-chromium
• Support for SSE2-only processors in the 32-bit build
• Manifest V2

Reference

https://github.com/win32ss/supermium