How to Configure Proxy in Mozilla Firefox
Updated:
Unlike Chrome and Edge—which rely on your operating system's network stack—Mozilla Firefox includes its own independent built-in Network Settings dialog (about:preferences#general) plus native per-tab proxy isolation through Firefox Multi-Account Containers and FoxyProxy.
Settings > General > Network Settings > Manual proxy configuration (HTTP / HTTPS)- 1 IP₫40,000
- 5+ IPs₫35,000
- 10+ IPs₫25,000
- 20+ IPs₫25,000
- 50+ IPs₫25,000
- 100+ IPs₫25,000
- 200+ IPs₫25,000
- 500+ IPs₫25,000
- 1000+ IPs₫22,000
- 2000+ IPs₫20,000
- 1 IP₫40,000
- 5+ IPs₫35,000
- 10+ IPs₫25,000
- 20+ IPs₫25,000
- 50+ IPs₫25,000
- 100+ IPs₫25,000
- 200+ IPs₫25,000
- 500+ IPs₫25,000
- 1000+ IPs₫22,000
- 2000+ IPs₫20,000
Why Firefox Is Ideal for Browser-Only Proxy Routing
Firefox manages its own HTTP/HTTPS socket pool, DNS-over-HTTPS resolver, and WebRTC media pipeline independently of Windows or macOS:
| Capability | Mozilla Firefox | Google Chrome / Edge (Default) |
|---|---|---|
| Built-in Independent Proxy GUI | Yes (Settings → Network Settings → Manual proxy) | No (opens OS-wide proxy settings) |
| Per-Tab Proxy Isolation | Yes (Multi-Account Containers + FoxyProxy) | No (requires separate Chrome user profiles) |
| WebRTC Leak Disabling | Built-in (media.peerconnection.enabled = false) | Requires extension |
| DNS-over-HTTPS / Remote DNS | Built-in checkbox & DoH settings | Tied to OS / Secure DNS |
Step-by-Step Setup in Firefox Network Settings
bash
// Recommended Firefox about:config hardening for proxy privacy
media.peerconnection.enabled = false
network.proxy.socks_remote_dns = true
network.trr.mode = 2 // Enable DNS-over-HTTPS via proxy
Per-Tab Proxies with Firefox Multi-Account Containers
- Firefox lets you run 10+ isolated cookie jars and 10+ different VinaProxy IPs inside a single browser window: install Mozilla's official 'Firefox Multi-Account Containers' extension alongside FoxyProxy Standard.
- In FoxyProxy v8+, assign each VinaProxy HTTP(S) proxy to a specific Firefox Container tab (e.g., Personal = US IP, Work = Vietnam ISP IP, Shopping = Japan IP).
Step by step
- 1
Open Firefox Network Settings
Open Firefox Settings (
about:preferences), scroll all the way to the bottom to the 'Network Settings' section, and click 'Settings...'. - 2
Select Manual Proxy Configuration
Choose 'Manual proxy configuration', enter your VinaProxy IP address in 'HTTP Proxy' and the port in 'Port', then check 'Also use this proxy for HTTPS'.
- 3
Set Localhost Bypass and Save
Add
localhost, 127.0.0.1to the 'No proxy for' box, leave SOCKS Host blank when using a paid HTTP(S) proxy, and click OK. - 4
Authenticate and Disable WebRTC Leaks in about:config
Visit https://vinaproxy.com/tools/proxy-checker and enter your VinaProxy Username and Password when prompted. Optionally open
about:configand setmedia.peerconnection.enabledtofalse.
Frequently asked questions
Does setting a Manual Proxy in Firefox affect Chrome or other apps on my PC?
No! Firefox's Manual Proxy Configuration applies exclusively to Firefox. Chrome, Edge, and desktop applications remain on your direct connection.
Why should I check 'Also use this proxy for HTTPS' in Firefox?
If you leave that box unchecked, Firefox only routes plain http:// sites through the proxy and connects directly on https:// sites.
How do I stop Firefox from asking for my proxy password every time I open it?
Check 'Save password' in Firefox's authentication dialog, or use the FoxyProxy extension which injects the Proxy-Authorization header automatically on startup.
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