Windows 8.1 can slow down with too many installations. Portable apps keep your registry clean.
First, you need a browser engine that still supports Windows 8.1 and runs from a USB stick or a local folder without installation. duckduckgo browser download for windows 81 portable
The hallmark of the DuckDuckGo browser is the "Fire Button" that clears all tabs and data in one tap. You can replicate this in your portable setup by: Configuring the browser to Windows 8
A highly customizable, privacy-centric browser that works perfectly on Windows 8.1. 2. Add the DuckDuckGo Privacy Essentials duckduckgo browser download for windows 81 portable
DuckDuckGo Browser Download for Windows 8.1 Portable: A Complete Guide
Does an Official DuckDuckGo Desktop Browser for Windows 8.1 Exist?