TL;DR
Yes, a browser-based HTTPS proxy can add an extra layer of security even when you’re already using a system-level proxy. However, the effectiveness depends on how things are configured and what you’re trying to protect against. The browser proxy encrypts traffic between your computer and the proxy server; the system proxy handles traffic before it reaches the browser.
Understanding the Layers
Think of it like this:
- System Proxy: Controls all network requests from applications on your computer. It’s a broad gatekeeper.
- Browser Proxy: Controls only traffic originating from that specific browser. It’s more focused.
Using both means the data goes through two proxy servers, adding complexity but potentially increasing security.
Step-by-Step Guide
- Configure Your System Proxy: This is usually done in your operating system’s network settings. The exact steps vary depending on your OS (Windows, macOS, Linux). You’ll need the proxy server address and port.
- Windows: Settings > Network & Internet > Proxy
- macOS: System Preferences > Network > Advanced > Proxies
- Linux: Often configured through environment variables or a GUI network manager.
- Configure Your Browser’s HTTPS Proxy: Most browsers (Chrome, Firefox, Edge) allow you to set a proxy server independently of the system settings.
- Chrome/Edge: Settings > System > Open your computer’s proxy settings (this will take you to the OS proxy settings). You can also use extensions like Proxy SwitchyOmega for more control.
- Firefox: Options > General > Network Settings > Settings…
When configuring the browser proxy, ensure you select HTTPS as the protocol if available.
- Verify System Proxy is Working: Use a website like WhatIsMyIP before enabling the browser proxy. Note your IP address.
curl https://api.ipify.org - Verify Browser Proxy is Working: Enable the browser proxy and revisit WhatIsMyIP within that browser. The IP address should now be different (the proxy server’s IP).
If it shows the same IP, double-check your browser’s proxy settings.
- Test with HTTPS Websites: Visit a secure website (e.g., Google). The browser should show a valid SSL/TLS certificate for the proxy server, not your original connection.
Look for the padlock icon in the address bar.
What Does This Protect Against?
- Local Network Snooping: The browser proxy encrypts traffic within your local network, protecting it from eavesdropping.
- ISP Monitoring (to some extent): Your ISP will see a connection to the HTTPS proxy server, but not the specific websites you visit if the proxy is well-configured and uses end-to-end encryption.
Limitations & Considerations
- System Proxy Still Sees Traffic: The system proxy still handles initial connections. If it’s compromised, your data could be intercepted before reaching the browser.
- Proxy Server Trust: You are trusting the HTTPS proxy server operator. Choose a reputable provider.
- Performance Impact: Using two proxies can slow down browsing speed.
- DNS Leaks: Ensure your DNS requests are also routed through the proxy to prevent leaks of your browsing history. Configure DNS settings within the browser or use a proxy server that handles DNS resolution.