Reviewed October 5th, 2020
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Mozilla Firefox

Mozilla Corporation


Firefox is an open-source browser that is designed for user privacy. There are also several extensions you can get that will block ads, prevent you from being tracked on certain websites, and more. The browser can be downloaded for free on all major platforms.

Breach History

Has there ever been a breach or data leak?


Date of last breach

January 2020

In early 2020, a bug existed in Firefox for about two days that allowed hackers to exploit the Javascript code to hack a user's PC and install malicious code outside of Firefox. The bug was patched almost immediately, but posed a serious danger to anyone who did not quickly perform the update.

Privacy Checklist

Does it meet our minimum privacy standards?

Is any kind of biometric data collected (health, heart, voice, etc.)?


Are you able to delete your data / the data collected about you?


Does it use cookies, telemetry, or third-party tracking scripts?


Is the privacy policy user-friendly (easy to understand)?


Does it have parental controls?


Does it use encryption to protect your data both in-transit and at-rest?


Does it get regular software and / or firmware updates?


Does it require you to create a strong password?


Is there a system in place for managing security vulnerabilities?


Does it have a privacy policy?


How Can It Snoop?

What sensitive hardware access requirements does it have?

Does it have a camera or request / require access to a camera?


Does it have a microphone or request / require access to a microphone?


Does it track your location or request / require access to location data?


Account Requirements

What information is required to create an account or use it?

Does it require an email address to use?


Does it require a phone number to use?


Does it require an address (home or office) to use?


Payment Options

What payment methods are available?

Are you able to use a credit card as a payment option?


Are you able to use a cryptocurrency as a payment option?


Are you able to use PayPal as a payment option?


Are you able to use cash or gift cards as a payment option?


What Could Go Wrong?

What's the worst case scenario for your data?

There is not much risk when using Firefox. You can set Firefox to automatically delete cookies, login data, and browsing history when the window is closed so no data is stored by Mozilla. Firefox does use your IP address to set your default search engine and suggest relevant content based on your location. However, if you use a VPN, this risk can easily be avoided since a VPN masks your IP address. The bug bounty program also suggests Firefox may be able to be hacked, but if your data is automatically deleted by the browser, there would be nothing to find if you were hacked.

How Does It Share Your Data?

Where is your data going? Who has access to it?

Firefox sends data about your interactions with Firefox and certain technical data to Mozilla for improvement purposes. This data is not shared with any third parties.

Good Things

Why should you use it?

  • Allows you to manage what data is stored by Firefox.
  • Data can be deleted automatically when closing the browser.

Bad Things

What are the downsides?

  • Bug bounty program.
  • Location data is viewable.

Final Thoughts

Firefox is typically a very privacy-focused browser, and does not collect any significant user information unless you allow it to. It was breached in 2020, but this was quickly patched and has not been a problem since then. If you want a more privacy-focused alternative to Google Chrome or Microsoft Edge, Firefox is a good choice.

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