Firefox is a popular, open-source web browser developed by the Mozilla Foundation. It offers a wide range of customization features, enhanced security, and privacy options. Firefox is available for various operating systems such as Windows, macOS, Linux, and on mobile platforms like Android and iOS.


The phonetic spelling of the keyword “Firefox” is: F as in FoxtrotI as in IndiaR as in RomeoE as in EchoF as in FoxtrotO as in OscarX as in X-ray

Key Takeaways

  1. Firefox is a fast and privacy-focused web browser developed by Mozilla Foundation.
  2. It offers a variety of customization options, add-ons and extensions for a personalized browsing experience.
  3. Firefox actively blocks trackers and harmful software to protect user privacy and enhance security.


Mozilla Firefox is a pivotal and influential web browser in the technology landscape, as it plays a significant role in promoting a more open, secure, and privacy-focused internet experience.

First released in 2004, Firefox has consistently demonstrated its commitment to user control and innovation by offering a fast, feature-rich browser that actively supports open-source development and web standards.

As a non-profit, Mozilla positions itself as a counterpoint to more heavily commercialized and less user-responsive browsers, with a mission focused on ensuring an open, accessible web.

Firefox’s importance also stems from its role in fostering competition among web browsers, pushing the industry towards better performance, boosted security, and enhanced privacy for users worldwide.


Firefox, developed by Mozilla Corporation, is an open-source web browser designed to provide users with fast, secure, and reliable access to the internet. Its primary purpose is to enable people to navigate the World Wide Web seamlessly and securely. Firefox aims to promote user privacy and security, offering a vast range of customization options to enhance the browsing experience.

As a significant competitor to other web browsers such as Google Chrome, Apple Safari, and Microsoft Edge, Firefox constantly updates its features to maintain a cutting-edge browsing experience for its users. Some noteworthy features of Firefox include an in-built ad-blocker, tracking protection, and support for thousands of add-ons or extensions to enhance its functionality. These add-ons address diverse needs, allowing users to tailor their browsing experience to their personal preferences.

In addition to add-ons, Firefox permits users to synchronize their browsing data, bookmarks, and preferences across multiple devices with a single account. Furthermore, Firefox focuses on the development of new technologies such as virtual and augmented reality experiences on the web. Mozilla continuously works to refine and expand Firefox, positioning this browser as a solid choice for users seeking a balance between customization, privacy, and speed.

Examples of Firefox

Firefox Browser: A popular open-source web browser developed by Mozilla Corporation, Firefox was first released in 2002 under the name “Phoenix” and later as “Mozilla Firefox.” Over the years, it has gained a significant user base due to its focus on user privacy, security, and a rich ecosystem of browser extensions. Firefox supports various web standards, making it compatible with numerous websites across the internet.

Firefox Send: Firefox Send was a free file-sharing service launched by Mozilla in

It allowed users to send encrypted files up to

5 GB in size to recipients. The service emphasized privacy, with files being stored temporarily and automatically deleted after a specified time or number of downloads. However, due to issues with malware sharing, Mozilla discontinued the service in September

Firefox Monitor: Introduced in 2018, Firefox Monitor is a security feature integrated into the Firefox browser that alerts users if their email addresses and personal information have been compromised in a known data breach. The service uses the “Have I Been Pwned?” database to check if a user’s email address is associated with any known breaches, allowing users to take the necessary actions to secure their online accounts.

Frequently Asked Questions about Firefox

What is Firefox?

Firefox is a free and open-source web browser developed by Mozilla Foundation and its subsidiary, Mozilla Corporation. It is available for various operating systems such as Windows, macOS, Linux, and Android.

What makes Firefox different compared to other browsers?

Firefox stands out by being committed to user privacy, security, and offering an extensive library of customizable add-ons. It is developed by a non-profit organization, and they work to create a fast, secure, and customizable web browsing experience for the users.

Is Firefox secure?

Firefox is considered to be one of the most secure browsers available today. It offers various security features such as tracking protection, private browsing mode, automatic updates, and various add-ons for enhanced security.

How can I customize Firefox?

Firefox can be customized through its extensive library of add-ons, themes, and browser settings. You can access these options through the browser’s menu, and you can also acquire additional add-ons from Mozilla’s official add-ons repository.

Does Firefox have a mobile version?

Yes, Firefox is available for mobile devices running on Android and iOS. The mobile version of Firefox offers the same level of security, privacy, and customization as the desktop version.

How do I update Firefox to the latest version?

Firefox updates itself automatically by default. However, you can manually check for updates by navigating to the browser’s menu, selecting “Help,” and then clicking on “About Firefox.” If an update is available, it will be downloaded and installed automatically.

Related Technology Terms

  • Web Browser
  • Mozilla Foundation
  • Open Source
  • Add-ons
  • Privacy Features

Sources for More Information


About The Authors

The DevX Technology Glossary is reviewed by technology experts and writers from our community. Terms and definitions continue to go under updates to stay relevant and up-to-date. These experts help us maintain the almost 10,000+ technology terms on DevX. Our reviewers have a strong technical background in software development, engineering, and startup businesses. They are experts with real-world experience working in the tech industry and academia.

See our full expert review panel.

These experts include:


About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

More Technology Terms

Technology Glossary

Table of Contents