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Best VPN Extensions for Mozilla Firefox

Illustration of laptop computer with Mozilla Firefox logo in the center
Simon Migliano Head of Research at Top10VPN

Simon is a recognized world expert in VPNs. He's tested hundreds of VPN services and his research has featured on the BBC, The New York Times, CNet and more. Read full bio

The very best VPN extensions for Firefox will hide your IP address while you browse and unblock web content from around the world.

Sadly, even a private browser like Firefox isn’t much better than Google Chrome at protecting your anonymity when you surf the web. That’s why we recommend using a safe VPN with your internet browser. Even Mozilla will tell you that, and unsurprisingly they recently launched their own Firefox VPN.

The best VPN extensions for Firefox will prevent your Internet Service Provider (ISP) from collecting your web browsing activity. They will also protect your confidential data transfers on public WiFi, and bypass geographical restrictions on video content. In fact, most of the VPN addons on this page will unblock US Netflix and other streaming services like BBC iPlayer, Disney+ and Hulu.

Based on our most recent tests, the five best VPNs for Firefox in May 2021 are:

  1. ExpressVPN: The best overall VPN browser extension for Firefox. Read Summary
  2. NordVPN: A high-quality, budget VPN that easily unblocks streaming services. Read Summary
  3. Windscribe: A good Firefox add-on that unblocks the most Netflix libraries. Read Summary
  4. Private Internet Access: The fastest Firefox VPN on same-country connections. Read Summary
  5. Surfshark: A very affordable VPN service with a fast and secure Firefox add-on. Read Summary

You can install all of the above Firefox VPN add-ons directly from Firefox’s add-on store. Keep reading to learn about our five recommended VPNs for Firefox in detail. We’ll also explain how to install a VPN on Firefox, how to disable WebRTC leaks, and the difference between a VPN browser extension and a full VPN.

Firefox WebRTC issues: The latest versions of Firefox (from 73.0 to 78.0) are causing many VPN add-ons to leak WebRTC requests. This includes some VPNs that have built-in WebRTC leak protection. To fix this issue, we recommend disabling WebRTC within your Firefox settings.

5 Best VPN Addons for Firefox in 2021

1. ExpressVPN: Best Firefox VPN Addon

Fast speeds, strong leak protection, and full VPN functionality.

ExpressVPN's new app on mobile devices
ExpressVPN's new desktop app
(1,760 user reviews)
Visit ExpressVPN
  1. Control the desktop VPN through Firefox extension
  2. Excellent VPN speeds & reliability
  3. Unlocks Netflix, iPlayer & other streaming services
  4. Working WebRTC leak protection
  5. Privacy-friendly logging policy
  6. VPN servers in 94 countries
  1. More expensive than rivals
  2. Requires the main VPN application to run
  • Best Price

    $6.67/mo over 15 Months

    See all plans

  • Top Speedi

    88Mbps same city speed

    Based on a 100Mbps test connection

  • Servers

    94 countries, 3,000+ servers

  • Compatible with

    • Windows logoWindows
    • Mac logoMac
    • iOS logoiOS
    • Android logoAndroid
    • Linux logoLinux

The Bottom Line

Ranked #1 VPN for Firefox

ExpressVPN is currently the best VPN for Firefox. It is one of the fastest and most private VPN services available today, protecting your online privacy and bypassing geographical restrictions effectively.

Unlike most VPN browser extensions, ExpressVPN’s add-on works alongside the main VPN app to provide full device protection. This means you can control the full VPN without leaving the Firefox browser window.

The ExpressVPN add-on encrypts your internet traffic with the ‘unbreakable’ cipher AES-256, and it also comes with a VPN kill switch, WebRTC leak blocking, and HTTPS Everywhere to further secure your web browser traffic.

Moreover, ExpressVPN doesn’t collect any personally-identifiable user web logs. In other words, none of your web browsing activity is tracked or stored on ExpressVPN’s servers.

For Firefox VPN users hoping to find a VPN extension that works with Netflix, look no further. ExpressVPN is the best VPN for Netflix, unblocking 19 international libraries. It also works with Disney+, Hulu, BBC iPlayer, HBO Max, and many more services.

Overall, ExpressVPN is the top VPN extension for Firefox if you want full control of your VPN from your web browser. If you ever run into issues with the VPN, you can contact its 24/7 live chat support, who in our experience are always quick and helpful.

For a more in-depth look, read our full ExpressVPN review.

2. NordVPN: Best Budget Firefox Addon

An affordable, no-logs VPN that unlocks over 400 streaming services.

NordVPN Mobile App Screenshot
NordVPN app
(246 user reviews)
Visit NordVPN
  1. VPN proxy extension for Firefox
  2. Very fast VPN speeds
  3. Working WebRTC leak protection
  4. Consistent access to Netflix & BBC iPlayer
  5. Strict zero-logs policy
  6. 24/7 live support
  1. Can’t use Firefox extension & desktop app together
  2. Doesn't work well in China
  • Best Price

    $3.71/mo over 24 Months

    See all plans

  • Top Speedi

    93Mbps same city speed

    Based on a 100Mbps test connection

  • Servers

    59 countries, 5,515 servers

  • Compatible with

    • Windows logoWindows
    • Mac logoMac
    • iOS logoiOS
    • Android logoAndroid
    • Linux logoLinux

The Bottom Line

Ranked #2 VPN for Firefox

NordVPN is another great VPN for Firefox, although it’s not as good as the ExpressVPN add-on. The main difference is that NordVPN’s Firefox extension only encrypts your web browser traffic, leaving internet traffic from other apps unprotected and visible to your ISP and third-parties.

Essentially, NordVPN’s Firefox add-on doesn’t give you the same level of security and privacy as its desktop apps. That said, NordVPN’s HTTPS proxy extension is ideal if you want to unblock geo-restricted video content without a full VPN client running in the background.

In fact, NordVPN is a very good VPN for streaming. It works well with most popular streaming platforms. NordVPN even claims it can unlock over 400 streaming services worldwide. We tested many of these, and it did work on most occasions.

What’s more, NordVPN’s Firefox add-on includes WebRTC leak blocking to mask your real IP address, and it also comes with CyberSec, an effective ad-blocker.

If you do want full VPN coverage you can use NordVPN’s desktop and mobile apps, which are very safe to use and will protect your Firefox traffic as well as all your other apps. However, NordVPN recommends not using its browser extensions and applications together, since it can confuse itself resulting in an IP leak.

All in all, NordVPN is a solid alternative to ExpressVPN, and it comes at a very affordable price over longer subscriptions.

For a more in-depth look, read our full NordVPN review.

3. Windscribe: Best Free VPN for Firefox

A free and paid VPN add-on that unblocks 40+ Netflix libraries.

Windscribe mobile screenshots
Windscribe desktop screenshots
(2 user reviews)
Visit Windscribe
  1. Firefox VPN add-on with many features
  2. Decent downloads speeds
  3. Blocks WebRTC leaks
  4. Paid VPN works with 42 Netflix libraries
  5. Free VPN unlocks US Netflix & BBC iPlayer
  6. Minimal logging
  1. Speeds could be faster
  2. Won't work in high censorship countries
  3. Doesn't block WebRTC
  4. No human live chat
  • Best Price

    $4.08/mo over 12 Months

    See all plans

  • Top Speedi

    95Mbps same city speed

    Based on a 100Mbps test connection

  • Servers

    63 countries

  • Compatible with

    • Windows logoWindows
    • Mac logoMac
    • iOS logoiOS
    • Android logoAndroid
    • Linux logoLinux

The Bottom Line

Ranked #3 VPN for Firefox

Windscribe’s recent update to its range of browser extensions makes it a strong contender for the best Firefox VPN. There are two versions of Windscribe’s Firefox extension: a paid and a free one.

The paid Firefox add-on has more features than any other VPN extension we’ve seen: WebRTC leak blocking (currently not working), an ad-blocker, and real-time malware protection. The VPN has also the ability to change your GPS location and web browser time to match the proxy location you’re connecting to.

Windscribe’s Firefox VPN is also excellent for unblocking Netflix libraries. It can access over 42 international catalogues – the highest number of any VPN we’ve reviewed so far. It also works with BBC iPlayer, which it struggled with in the past.

As for Windscribe’s free VPN extension, it only allows access to 10 countries and it comes with a monthly 10GB data cap. However, it is the only free VPN that works with US Netflix and BBC iPlayer.

Unfortunately, just like NordVPN’s browser extension, Windscribe’s add-ons only encrypt web browser traffic, meaning traffic outside the browser will still use your real IP address. However, Windscribe has future plans to enable remote control of the desktop app through its browser extensions in the near future, much like ExpressVPN’s browser extension does currently.

Another drawback of Windscribe is that its download speeds don’t quite match those of our top VPN recommendations. We measured an average download speed of 68Mbps when connecting from London to the US – this means Windscribe isn’t slow, but it’s not the quickest VPN either.

There’s also a lack of live chat support. You can talk to ‘Garry’, Windscribe’s live chat bot, but it doesn’t always understand your questions, meaning that you have to resort to email support, which can be a little slow at times.

Nevertheless, Windscribe’s new and improved browser extension makes it one of the very best VPNs for Mozilla Firefox users. If you’re a VPN beginner you can start by using Windscribe’s free VPN, and if necessary, upgrade to the paid version.

Update: The latest version of Firefox (78.0) is causing Windscribe VPN to leak WebRTC requests. To fix this, you’ll need to disable WebRTC within your Firefox settings.

For a more in-depth look, read our full Windscribe VPN review.

4. PIA VPN: Best VPN for Speed

One of the fastest VPNs; ideal for quick and anonymous web browsing.

Private Internet Access
Private Internet Access
(27 user reviews)
  1. The fastest VPN of 2021
  2. Useful proxy extension for Firefox
  3. WebRTC leak blocking
  4. Works with Netflix, BBC iPlayer & Disney+
  5. Verified no-logs privacy policy
  6. 24/7 live chat assistance
  1. Doesn't work in China
  2. Doesn't block WebRTC
  • Best Price

    $2.69/mo over 26 months

    See all plans

  • Top Speedi

    98Mbps same city speed

    Based on a 100Mbps test connection

  • Servers

    77 countries, 35,900 servers

  • Compatible with

    • Windows logoWindows
    • Mac logoMac
    • iOS logoiOS
    • Android logoAndroid
    • Linux logoLinux

The Bottom Line

Ranked #4 VPN for Firefox

Private Internet Access (PIA) is an extremely fast and safe VPN for Firefox. Like most other VPN add-ons, it only encrypts browser traffic but, unlike NordVPN, you can use the desktop app and browser extension simultaneously for complete protection.

The best thing about PIA VPN is its sheer speed: it’s in fact the fastest VPN we’ve tested, with phenomenal speeds over short-distances. It’s also fast on longer-distances too, although ExpressVPN is the fastest connecting to far away servers.

Also, PIA recently improved its access to streaming services, unblocking favorite services like US Netflix, Disney+ and BBC iPlayer.

From a security standpoint, PIA VPN operates a strict no-logs policy for your online privacy, you can choose between AES 128-bit or 256 encryption. Plus, the Firefox browser add-on blocks WebRTC leaks.

Unfortunately, like most VPN services, Private Internet Access won’t work in China. If you’re travelling to China any time soon, we suggest you use ExpressVPN, or one of these VPNs instead.

Expert Tip: You need to activate PIA’s ‘Block WebRTC IP Detection’ via the extension settings to ensure there are no leaks. Without this on, PIA will leak WebRTC. 

For a more in-depth look, read our full Private Internet Access review.

5. Surfshark: Cheap VPN Proxy for Firefox

An affordable VPN extension with strong security and a strict no-logs policy.

Surfshark app
Surfshark app
(99 user reviews)
Visit Surfshark
  1. Secure Firefox proxy extension
  2. Above-average VPN speeds
  3. Works with Netflix and iPlayer
  4. Strict no-logs policy
  5. VPN servers in 61 countries
  6. 24/7 live chat customer support
  1. Not as fast as other top VPNs
  2. Doesn't block WebRTC
  • Best Price

    $2.49/mo over 24 months

    See all plans

  • Top Speedi

    85Mbps same city speed

    Based on a 100Mbps test connection

  • Servers

    66 countries, 3,200+ servers

  • Compatible with

    • Windows logoWindows
    • Mac logoMac
    • iOS logoiOS
    • Android logoAndroid
    • Linux logoLinux

The Bottom Line

Ranked #5 VPN for Firefox

Surfshark is a relatively new no-logs VPN and it already shows a lot of promise – its secure Firefox VPN proxy extension is one the best around.

A recent Cure53 independent audit of Surfshark VPN extensions proves that its Firefox VPN add-on is absolutely safe to use. It also comes with a ‘CleanWeb’ tool, which blocks ads, trackers, and even malware in real-time. Finally, Surfshark secures all VPN connections with the top-of-the-range AES-256 cipher.

Using the Surfshark Firefox add-on also let’s you unblock 12 Netflix libraries, plus BBC iPlayer, Disney+, Amazon Prime Video, and more. However, Surfshark’s browser extensions do not automatically block WebRTC requests, so you’ll have to disable WebRTC manually in your browser’s settings. You can find out exactly how to do this later on in this guide.

Also, Surfshark’s speeds haven’t been quite as good as other top VPN providers, although they have been improving considerably in the last few months. The current speeds are certainly fast enough for optimal web browsing and streaming.

Overall, Surfshark’s affordable price and advanced features make it a very attractive VPN for Firefox users. We hope to keep seeing improvements from Surfshark, particularly fixing its current issue with WebRTC leaks.

For a more in-depth look, read our full Surfshark VPN review.

Why Should You Use a VPN for Firefox?

Screenshot of the Firefox download page

While Firefox has a reputation for being a more privacy-friendly alternative to Google Chrome, using it doesn’t completely protect your personal data from snooping or malicious third parties.

Even when you use Private Browsing Mode, which erases your browsing information like passwords, cookies, and history locally (a bit like Chrome’s Incognito mode), your ISP and any eavesdroppers sniffing your traffic can see what you do online.

Here’s a warning on Firefox’s website:

Screenshot of Firefox's Private Browsing warning

That’s why you should still use a VPN when you use Firefox Private Browsing. VPNs encrypt all internet traffic flowing through your device and mask your IP address with a new IP address belonging to the VPN server. This ensures that your online activities remain private.

But that’s not the only reason you should use a VPN with Firefox.

VPNs also allow you to access restricted content – whether it’s your school, library, or government that has imposed the blocks.

If you use a VPN app on your desktop computer then there’s no immediate need to install a browser extension as your browser traffic will go through the encrypted VPN tunnel.

But there are still some benefits to using an extension.

Browser extensions often come with extra features such as ad and malware blockers, as well as WebRTC leak protection. These are sometimes missing on the main VPN apps.

Using a browsing extension is a lightweight alternative to using a device-wide VPN, so you may experience better browsing speeds.

If you’re a heavy browser user and you only want to protect browser traffic, a VPN add-on for Firefox may be a good solution for you.

How to Add a VPN Extension to Firefox

To use a VPN with Firefox simply find the VPN on the Firefox Add-ons website. Make sure it’s your chosen VPN provider’s official extension to avoid downloading the wrong (potentially malicious) extension, then click ‘Add to Firefox’.

Screenshot of the Firefox browser add-ons page for NordVPN

Once you’ve added the extension, you’ll be able to choose the VPN server location and connect from within your Firefox browser window.

You can read more about adding a VPN to your Firefox browser in our dedicated guide to setting up a Firefox VPN.

Some VPN browser extensions, like ExpressVPN’s Firefox add-on, require the main application/client to be running. In other words, the VPN extension just won’t work on its own.

Firefox VPN FAQs

What Is the Best VPN for Firefox?

ExpressVPN is the best VPN for Mozilla Firefox in September 2020. Users can get full VPN functionality from the ExpressVPN extension without leaving their Firefox browser window.

The ExpressVPN add-on secures your device’s internet traffic with AES-256 encryption, a VPN kill switch, data leak protection, and a strict no-logs policy. It will also unblock Netflix libraries in 19+ countries and works with additional streaming platforms including Hulu, HBO Max, Disney+ and BBC iPlayer.

Is Firefox a Private Browser?

Firefox is generally considered a more private alternative to Google Chrome. But is it really?

It depends. To start with, it’s open-source, which is a plus for transparency. Chrome is based on open-source components, but it isn’t open-source itself, so you can’t see the application’s code.

According to Mozilla’s privacy policy, Firefox doesn’t collect your browsing history unless you opt in. In contrast, when you log into your Google account it collects loads of information about your online activities.

Firefox also has Private Browsing mode which, like Incognito mode, erases your browsing information locally (i.e. on your personal computer).

Firefox allows users to tailor the Content Blocking feature to block some or all known trackers/cookies/fingerprinters, which is a great for privacy.

Screenshot of Firefox content blocking settings

But even with these extra privacy features, you still need to use a VPN with Firefox. That’s because your ISP can still monitor and store your browsing activity, and hackers can take advantage of your personal data over insecure internet connections.

Unlike Chrome, Firefox also allows you to disable WebRTC within the settings so that you can avoid any leaks while using a VPN.

For those really serious about privacy, you can find alternative browsers and learn exactly how to optimize Firefox for privacy in our guide to the best private browsers.

What’s the Difference Between a VPN Add-On and a Full VPN?

VPN device apps and VPN browser extensions (or add-ons) aren’t the same.

While a VPN sends all device internet traffic through an encrypted VPN tunnel, browser extensions are proxies that spoof the IP address associated with your browsing traffic.

Some browser add-ons encrypt traffic – these are called HTTPS proxies – but most don’t (they’re just HTTP instead).

That’s why we always recommend using a VPN desktop app over a browser extension for the best levels of privacy and security.

You can read more about the difference between VPNs and proxies in our separate guide.

If you do want to use a proxy instead of a VPN client, we’d recommend using a browser extension provided by a trusted VPN service.

If you don’t, you risk putting all your personal data into the wrong (and sometimes dangerous) hands.

What’s the Best Free VPN for Firefox?

It’s very important to protect your Firefox web traffic using a VPN – at the very least with an secure proxy browser extension. However, all but one of the VPN add-ons we recommend require a paid subscription.

While you can use a free VPN with Firefox, many free VPN extensions aren’t safe to use. Some log your browsing activity, and others leak your IP address. We’ve listed a few of these dangerous services in the next section of this guide.

At the moment, the best free Firefox VPN is Windscribe. Windscribe is a free VPN (it does offer a paid service, too) that comes with a full-featured Firefox browser extension. You’ll be limited to 10GB of data a month on the free subscription plan, although that should be enough for light web browsing.

We also suggest taking a look at our guide to the best free VPNs. They’re all trustworthy, anonymous, and work on Windows, macOS, iOS, and Android devices. Just connect to one of their secure servers to encrypt all of your Firefox traffic.

Like all good free VPN services, they do come with some limitations, such as slower speeds, reduced server locations, restricted data usage and no Netflix support.

Which Firefox VPNs Should You Avoid?

There are two Firefox VPN extensions to absolutely avoid:

  • Hola VPN
  • Hoxx VPN

These so-called VPNs are actually proxies that simply spoof your IP address. While this may work to access some blocked content, it’s not at all private.

In fact, these two proxy services may do more harm to your online privacy than good.

Hola works as a peer-to-peer network, essentially throwing your true IP address into a pool for other users to use and abuse as they please.

It doesn’t encrypt your internet traffic, and keeps logs of everything you do online.

Hoxx VPN claims to encrypt your browser traffic, but like Hola it collects information about the pages you’ve viewed through the proxy as well as your true IP address.

There are many other dodgy free VPNs and browser extensions available, but if you stick with our recommendations you’ll be safe.

Does Firefox Have a Built-in VPN?

Screenshot of Firefox Private Network website

Firefox currently doesn’t have a built-in VPN, however it is currently beta testing a proxy extension called Firefox Private Network in the US. The proxy extension encrypts all your browser traffic and masks your IP address using Cloudflare proxy servers.

Mozilla’s also planning on releasing a Full-Device VPN later this year. This shows the company’s commitment to improving its privacy offering.

Disabling WebRTC Leaks in Firefox

WebRTC is a browser-based technology that allows audio and video communications to work inside the browser. But it’s not great for privacy.

WebRTC can reveal your true IP address even when you use a VPN – we call these WebRTC leaks.

The best VPN services and browser extensions block WebRTC leaks so that your IP address remains hidden and protected. However, you can disable WebRTC manually within Firefox’s settings – unlike Chrome – just to be sure.

Can You Be Tracked If You Use a Firefox VPN?

Yes, you can be tracked even if you use a VPN with your Firefox browser.

VPNs encrypt your traffic and mask your true IP address, which prevents some forms of tracking. However, websites and advertisers still have tools that can monitor your online activities:

  • Cookies
  • Tracking pixels
  • Web beacons
  • Browser fingerprinting
  • Advertiser IDs

Firefox has a Content Blocking feature that can block many trackers – but crucially, not all of them.

Some VPN browser extensions also come with ad and tracker blockers, but even then big tech companies can still track your online activities.

When you log into online accounts such as Google you can be sure that you’re being tracked.

Google logs your searches and makes money from selling it to advertisers.

If you want to avoid being tracked online (as much as you possibly can) use a VPN, tracker/cookie blockers, and stay logged out of accounts that are provided by tech giants.

You can read more about online tracking on the EFF website.

About the Author

  • Simon Migliano Head of Research at Top10VPN

    Simon Migliano

    Simon is a recognized world expert in VPNs. He's tested hundreds of VPN services and his research has featured on the BBC, The New York Times, CNet and more. Read full bio