Outcome: You’ll turn on Firefox’s built-in VPN so websites see a masked IP instead of your real one while you browse in Firefox.

Who this is for: Firefox users who want a simple privacy boost without installing an extension or paying for a full VPN app.

Time required: About 2 minutes, if the rollout is available on your account and region.

Quick Answer

In Firefox 149 or newer, sign in with a Mozilla account, click the VPN icon in the toolbar, then switch Turn on VPN on. Firefox will route browser traffic through Mozilla’s built-in secure proxy and warn you as you approach the free 50 GB monthly limit.

If you only want browser-level privacy on public Wi-Fi, hotel networks, or during sensitive searches, this is one of the cleanest quick wins Firefox has added in a while. No extension clutter, no separate app, just a built-in toggle.

What this single trick actually does

Firefox’s built-in VPN hides your IP address for traffic that starts inside Firefox. That means websites and trackers see the VPN exit IP instead of your home, office, or coffee-shop connection. According to Mozilla’s support page, this feature is free, browser-only, and capped at 50 GB per month.

Important limit: this is not full-device protection. Apps outside Firefox are unaffected. If you want all-device coverage, Mozilla’s separate paid product is Mozilla VPN.

Prerequisites

  • Firefox 149 or newer
  • A signed-in Mozilla account
  • You are in a rollout-supported region if Mozilla has not enabled it globally yet
  • Roughly 50 GB or less of browser-only private traffic per month

Step-by-step: Turn on Firefox’s built-in VPN

  1. Update Firefox first.
    Open Firefox, click the menu button, then go to Help > About Firefox. Let it download updates if needed.
    Expected result: Firefox shows version 149 or newer after the update check finishes.
  2. Sign in to your Mozilla account.
    If you are not already signed in, use the account menu or follow Firefox’s sign-in prompt.
    Expected result: Firefox shows you as signed in, which is required for the built-in VPN rollout.
  3. Find the VPN icon or prompt.
    Look at the top-right toolbar for the VPN icon. If Firefox shows a setup prompt, click Get started.
    Expected result: The VPN panel opens inside Firefox.
  4. Turn the VPN on.
    In the VPN panel, switch Turn on VPN to enabled.
    Expected result: Firefox begins routing browser traffic through Mozilla’s secure proxy.
  5. Open a site that shows your public IP.
    Visit WhatIsMyIPAddress or a similar IP-check page in Firefox.
    Expected result: The site should show a different IP and often a different apparent location than your normal connection.
  6. Use site controls if needed.
    From the VPN panel or Firefox settings, manage website exceptions if a site breaks or you want to save data for selected pages.
    Expected result: You can keep the VPN on generally while excluding a site that does not behave correctly.

Expected result checks

  • The VPN icon is visible in Firefox and shows the feature as on
  • Your public IP looks different in Firefox when you test it
  • Regular browsing still works in Firefox
  • Firefox warns you when you are getting close to the 50 GB monthly limit

Common mistakes

  • Expecting system-wide protection: this only covers Firefox traffic, not Chrome, apps, games, or the rest of your device
  • Looking for it on older Firefox builds: the feature starts with Firefox 149 and is rolling out progressively
  • Skipping account sign-in: Mozilla account access is required
  • Using it for heavy streaming all month: 50 GB is useful, but it is not unlimited
  • Assuming every site will behave perfectly: some sites may need to be excluded or retried without the VPN

Troubleshooting

  • No VPN option appears: confirm you are on Firefox 149+, signed in, and in a supported rollout region. Mozilla says availability is progressive, so some users will simply need to wait.
  • Your IP does not change: make sure the toggle is actually on, then reload the IP-check page in Firefox, not another browser.
  • A site will not load correctly: open Firefox’s VPN controls and add that site to the exception list or briefly turn VPN off for that page.
  • You hit the data cap too fast: reserve the feature for public Wi-Fi, account logins, travel, or sensitive browsing instead of all-day video streaming.
  • You want full-device privacy: use a full-device tool such as Mozilla VPN instead of the built-in browser-only option.

Reference links

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Next step

Turn it on, test your IP once, then save the feature for the moments that matter most: public Wi-Fi, travel, private research, and account logins you would rather not do in the clear.