Mozilla

Mozilla
Company type	Collective
Industry	Software, Internet
Founded	1998
Founder	Former Netscape personnel
Headquarters	United States
Area served	Worldwide
Key people	Mitchell Baker (CEO), Steve Teixeira (Chief Product Officer), Mark Surman (Executive Director, Mozilla Foundation)
Products	Firefox, Thunderbird, Bugzilla, Gecko engine, Firefox OS (discontinued), Mozilla Persona (discontinued), Mozilla VPN, A-Frame
Number of employees	~1000 before 2020 reductions
Website	mozilla.org

Mozilla is a free software collective established in 1998 by former Netscape personnel. It focuses on creating, distributing, and maintaining Mozilla-branded products to advance free software principles and open standards. The initiative receives organizational backing from the nonprofit Mozilla Foundation alongside its taxable branch, the Mozilla Corporation.

Among Mozilla's primary offerings are the Firefox web browser, the Thunderbird email client (now managed through a subsidiary), the Bugzilla bug tracking platform, and the Gecko rendering engine.

History

On January 23, 1998, Netscape declared that its browser software would be released as free and open source. The project adopted the name "Mozilla," derived from Netscape Navigator’s original codename—a blend of "Mosaic" and "Godzilla." A small group of Netscape staff members organized and led this emerging community.

Mozilla’s initial goal was to develop technology that companies such as Netscape could commercialize. Following AOL’s reduced engagement in 2003, legal stewardship of the project transferred to the Mozilla Foundation. The organization transitioned away from the integrated Mozilla Suite toward individual applications like Firefox and Thunderbird, which were distributed directly to end users.

The organization broadened its scope by launching Firefox for Android, developing a mobile operating system called Firefox OS (later discontinued), introducing a web-based identity framework named Mozilla Persona (also discontinued), and establishing an app marketplace centered on HTML5 technologies.

In 2011, Mozilla reported revenues of $163 million, marking a 33% rise compared to 2010, with approximately 85% stemming from its contract with Google.

By 2013, Mozilla collaborated with Cisco to integrate Cisco’s open-source H.264 codec into Firefox to enable playback of proprietary video formats; Cisco assumed responsibility for associated patent royalties. This strategic decision balanced user retention with future efforts advocating for free video standards.

That same year, Mozilla invested in game development through its Game Creator Challenge, mandating that games utilize open web technologies and JavaScript. In 2017, Mozilla unveiled a refreshed brand identity featuring a new logo incorporating "://", alongside commissioning the open-source slab serif font Zilla Slab.

Confronted with a decline in market share—from 30% down to 4% over a decade—Mozilla reduced its workforce by 25% in 2020, cutting roughly one-quarter of its nearly 1,000 employees to manage expenses. Despite these reductions, executive remuneration increased notably; CEO Mitchell Baker earned $2.4 million in 2018. Later that year, Mozilla shuttered its Mountain View office.

In 2024, Mozilla underwent another rebranding effort with the slogan "Reclaim the Internet," supported by branding agency Jones Knowles Ritchie.

Values

In November 2022, Executive Chairwoman and CEO Baker, Chief Product Officer Steve Teixeira, and Mozilla Foundation Executive Director Mark Surman communicated that Mozilla is reevaluating its business approaches while exploring new internet roles as a societal institution. Although Firefox’s market share continues to decline, the organization remains dedicated to innovation, demonstrated by launching Mozilla Ventures—a $35 million fund aimed at backing founders and products focused on building a privacy-centric internet.

Mozilla has occasionally incorporated proprietary elements such as licensing the H.264 codec and endorsing paid games developed with open technologies.

Mozilla Manifesto

The Mozilla Manifesto articulates the organization's core mission and guiding values, underscoring its dedication to maintaining an open, worldwide internet as an essential platform for communication, learning, commerce, and societal development. It emphasizes Mozilla’s collaborative, community-driven model in creating open source software and joint initiatives. The manifesto outlines ten key principles that highlight the significance of universal internet access, safeguarding user privacy and security, empowering individuals, promoting interoperability and innovation, ensuring transparency, and balancing commercial objectives with the public good.

Pledge

As stated by the Mozilla Foundation:

Mozilla Builders

In 2020, Mozilla launched Mozilla Builders, an experimental incubator aimed at "Fix-The-Internet," which supported 80 projects divided among three subprograms: The Startup Studio, The MVP Lab, and The Open Lab. The website for this program has since been archived.

Mozilla Ventures

On November 2, 2022, during the Web Summit held in Lisbon, Mozilla announced the forthcoming debut of Mozilla Ventures in 2023. This $35 million venture capital and product incubation fund is designed to back early-stage startups from seed rounds through Series A funding. Its focus is on enterprises that align with the principles outlined in the Mozilla Manifesto. Mohamed Nanabhay serves as the founding Managing Partner, with a vision to cultivate a network of entrepreneurs dedicated to building a better internet.

Before the official launch, Mozilla Foundation President Mark Surman disclosed the first trio of investment recipients: Secure AI Labs, Block Party, and HeyLogin.

Firefox

Firefox represents a suite of software products developed by Mozilla, with the Firefox browser serving as its flagship offering.

Firefox browser

The Firefox web browser is accessible on both desktop and mobile platforms. It utilizes the Gecko rendering engine to display web content according to current and emerging web standards. Globally, Firefox commands approximately 10–11% of the browser market, making it the fourth most popular browser worldwide.

Firefox began as an experimental offshoot from the Mozilla codebase by founders Dave Hyatt, Joe Hewitt, and Blake Ross. Their goal was to create a standalone browser free from the commercial pressures and feature bloat that had affected the Mozilla Suite.

The browser was initially named Phoenix, but due to trademark issues it was renamed Firebird. However, objections from the Firebird database community prompted a final rebranding to Firefox in February 2004.

In 2019, Mozilla revealed intentions to introduce a premium version of Firefox. CEO Chris Beard clarified that all existing free features would remain free; however, a subscription-based premium tier was planned. Firefox Premium Support was launched at $10 per installation targeting enterprise users but was soon removed from Mozilla’s website after reports suggested its announcement had been premature.

In October 2023, Mozilla renamed consumer 'Firefox accounts' to 'Mozilla accounts' to better reflect the wider range of products beyond just Firefox. This rebranding effort aims to enhance brand cohesion and showcase Mozilla’s growing suite of services used by millions globally:

“The original ‘Firefox’ branding no longer accurately reflects the broad scope of Mozilla's offerings... The renaming creates a more consistent brand experience across all Mozilla surfaces.”

Firefox for mobile

Firefox for mobile, internally known as Fennec, represents Mozilla Firefox’s browser tailored for smartphones and tablets. It is distributed in two distinct editions: Firefox for Android and Firefox for iOS. The Android variant operates on the Android mobile operating system and utilizes the Gecko rendering engine identical to that of the desktop Firefox; for example, version 1.0 incorporated the engine from Firefox 3.6, while version 4.0 shared its core architecture with Firefox 4.0. Conversely, Firefox for iOS runs on Apple’s iOS platform but relies on the native WebKit rendering engine due to Apple's application guidelines. Both editions support features such as HTML5 compatibility, Firefox Sync, private browsing modes, anti-tracking protections, and tabbed navigation. Moreover, Firefox for Android allows the use of extensions.

Firefox Focus

Firefox Focus is a privacy-centric mobile browser available free and as open-source software for both Android and iOS devices. Initially released in 2015 as an iOS app focused on blocking trackers, it has since developed into a comprehensive browser across both platforms.

Firefox Lockwise

Firefox Lockwise served as Mozilla’s password management solution integrated within the desktop Firefox browser and also offered as a standalone application on mobile platforms, functioning as the primary password manager there.

Firefox Monitor

Firefox Monitor is an online tool designed to notify users if their email address or passwords have appeared in any known data breaches.

Firefox Send

Firefox Send was Mozilla’s encrypted file transfer service. It was discontinued and removed from Mozilla’s offerings in September 2020.

Solo AI Website Creator

Solo is a complimentary AI-powered website builder created specifically for solopreneurs, facilitating straightforward and efficient website development without requiring coding expertise.

Mozilla VPN

Mozilla VPN, previously known as Firefox Private Network, is a subscription-based VPN service that includes a complimentary privacy extension to bolster online security across multiple devices.

A-Frame

A-Frame is an open-source web framework developed by Mozilla in 2015 to streamline the creation of virtual reality (VR) and 3D web content. Constructed atop WebGL with an HTML-like syntax, it empowers developers to build immersive VR experiences compatible with desktop browsers and mobile VR hardware such as Oculus Rift and Google Cardboard. By integrating with libraries like Three.js, A-Frame advances Mozilla’s vision of an open immersive web through WebXR. It has gained significant adoption within VR and web development circles by enabling accessible VR content creation directly in browsers without requiring specialized software.

Firefox Private Relay

Firefox Private Relay provides users with disposable email addresses to minimize spam by masking their actual email and organizing subscriptions via categorized aliases. Introduced as a Firefox add-on on April 9, 2020, it moved beyond beta status when launching a Premium subscription in November 2021. Premium users receive unlimited alias emails using @mozmail.com domains, replacing the initial @relay.firefox.com alias format.

Firefox Reality

Introduced in September 2018, Firefox Reality was Mozilla's browser tailored for virtual reality environments, originally launched for Oculus Rift devices. By January 2019, HTC collaborated with Mozilla to bring Firefox Reality compatibility to Vive headsets. In February 2022, the project’s management was handed over to Igalia, which renamed it Wolvic. Mozilla has since discontinued support for Firefox Reality.

Firefox OS

Firefox OS, initially known as Boot to Gecko or B2G, was an open-source operating system created by Mozilla to run HTML5 applications using open web technologies instead of relying on native APIs tied to specific platforms. This architecture allowed HTML5 apps direct hardware access through JavaScript and standard Web APIs.

Devices that operated on Firefox OS included models such as the Alcatel One Touch Fire, ZTE Open, and LG Fireweb. Development of Firefox OS ceased in December 2015 by Mozilla. Nevertheless, a derivative project called KaiOS continues its evolution and powers many affordable mobile devices.

Pocket

Pocket functioned as a mobile application and web platform designed for organizing and saving online articles for later reading. Mozilla Corporation acquired Pocket on February 27, 2017, broadening its reach within mobile content consumption markets. Originally created for desktop browsers, Pocket expanded support across macOS, Windows, iOS, Android, Windows Phone, BlackBerry devices, Kobo eReaders, and various web browsers. The service was officially retired on July 8, 2025.

Thunderbird

Thunderbird is a free email and news client compatible with multiple operating systems, developed by volunteers from the Mozilla Community.

In July 2012, Mozilla shifted Thunderbird’s development emphasis away from adding new features toward enhancing stability while promoting community-led innovation. On July 11, 2023, Thunderbird launched "Supernova," a significant update introducing a refreshed user interface and a reorganized code structure aimed at simplifying maintenance and enabling easier extension.

SeaMonkey

SeaMonkey—previously known as the Mozilla Application Suite—is a free and open-source internet suite available across platforms that combines a web browser, email and Usenet client, an HTML editor called Mozilla Composer, and the ChatZilla IRC client.

On March 10, 2005, the Mozilla Foundation declared it would halt official releases of the Mozilla Application Suite beyond version 1.7.x to concentrate efforts on standalone projects like Firefox and Thunderbird. Currently, SeaMonkey is maintained by the SeaMonkey Council, which secured trademark rights to the name with support from the Mozilla Foundation. The Foundation continues to offer hosting services for the project’s developers.

Bugzilla

Bugzilla is a web-based defect tracking system released as free software by Netscape Communications in 1998 alongside the initial Mozilla source code. Now overseen by Mozilla, Bugzilla is extensively utilized across various sectors for managing bugs in both open-source and proprietary software projects such as those maintained by the Mozilla Foundation, Linux kernel development, KDE, Red Hat, Eclipse, and LibreOffice.

WebThings

WebThings serves as an Internet of Things (IoT) management platform that provides a unified gateway and user interface adhering to the W3C Web of Things standards. Originally created by Mozilla, it became an independent initiative in 2020 after organizational restructuring led to layoffs. Also known as Project Things, it allows users to control IoT devices through decentralized software on hardware like Raspberry Pi.

NSS

Network Security Services (NSS) comprises a collection of libraries designed to facilitate cross-platform creation of security-enabled client and server software. It delivers a comprehensive free software cryptographic library implementation supporting SSL and S/MIME. Licensed under the Mozilla Public License 2.0, NSS maintains compatibility with the GPL.

Developed collaboratively by organizations such as AOL, Red Hat, Sun Microsystems/Oracle Corporation, and Google, NSS extends beyond Mozilla’s ecosystem, powering applications including Evolution, Pidgin, and LibreOffice.

SpiderMonkey

SpiderMonkey is the initial JavaScript engine crafted by Brendan Eich in 1995 during his work at Netscape. It became part of Mozilla’s assets after inheriting Netscape’s codebase in 1998. In 2011, stewardship was transferred to Dave Mandelin.

Implemented in C++, SpiderMonkey adheres to the ECMAScript specification and features an interpreter, several just-in-time compilers, a decompiler, and a garbage collector. It serves as the JavaScript engine for products like Firefox, Thunderbird, SeaMonkey, along with numerous third-party applications.

Rhino

Rhino is a free software Java-based JavaScript engine maintained by the Mozilla Foundation. It translates JavaScript code into Java classes and supports execution in both compiled and interpreted forms.

Gecko

Gecko is a browser engine that supports web standards such as HTML, SVG, and MathML. Developed in C++ alongside the Netscape Portable Runtime (NSPR) to ensure platform independence, its source is distributed under the Mozilla Public License. Gecko handles rendering of web pages and user interfaces in Firefox and is also utilized by Thunderbird, SeaMonkey, and various external applications.

Rust

Rust is a compiled programming language created by Mozilla Research, focusing on safety, concurrency, and high performance for complex software development. It forms the foundation of the experimental layout engine Servo, which was co-developed with Samsung. Although Servo has not yet reached end users directly, its components are intended for incremental integration into Gecko and Firefox to improve browser speed and security.

XULRunner

XULRunner is a Mozilla platform that allows applications built using Firefox extension technologies—such as XPCOM, JavaScript, HTML, CSS, and XUL—to operate as independent desktop programs on Windows, Linux, and macOS. This facilitates cross-platform deployment without requiring Firefox installation.

pdf.js

pdf.js is a JavaScript library developed by Mozilla that renders PDF files directly within browsers utilizing HTML5 Canvas technology. It comes pre-installed in Firefox and Thunderbird, removing dependency on external plugins. Additionally available as a standalone extension ("PDF Viewer") for Firefox on Android, SeaMonkey, and other versions lacking built-in support, pdf.js can also be embedded into websites to enable PDF viewing across compatible browsers.

Sccache

sccache is a Rust-based compiler cache tool that operates similarly to ccache. Functioning as a compiler wrapper, it stores compilation outputs either locally or on cloud platforms to accelerate build times. It provides caching support for code written in C/C++, Rust, and NVIDIA CUDA compiled with NVCC.

Shumway

Shumway was Mozilla’s open-source alternative to Adobe Flash Player, initiated in 2012. It utilized web standards like JavaScript and HTML5 Canvas to render Flash animations and run Actionscript code. Bundled by default with Firefox Nightly and available as an add-on for newer Firefox releases, its functionality was mainly suited for basic Flash content. The project was terminated in 2016.

Servo

Servo is a browser engine engineered for embedded systems and application use cases. In August 2020, Mozilla laid off the majority of the Servo development team amid the COVID-19 crisis and internal restructuring. The project’s development has since been continued under the Linux Foundation’s stewardship.

SOPS: Secrets OPerationS

SOPS is a tool designed for editing encrypted files across various formats including YAML, JSON, ENV, INI, and BINARY. It supports encryption through multiple key management services such as AWS KMS, GCP KMS, Azure Key Vault, age, and PGP.

Taskcluster

Taskcluster is a highly scalable task execution system that underpins Mozilla’s continuous integration and release workflows. Originally created to automate Firefox builds and testing processes, it now also supports the construction and distribution of Firefox, Thunderbird, NSS, and additional Mozilla projects.

WebXR Viewer

WebXR Viewer is an augmented reality browser designed to enable developers to build and experience AR applications using web technologies alongside ARKit integration.

Mozilla VR

Mozilla VR was dedicated to developing tools, standards, and specifications for an open virtual reality ecosystem on the web. It maintained a web framework enabling VR experiences and enhanced WebVR capabilities within browsers.

On April 26, 2018, Mozilla launched Hubs, a multi-user virtual environment powered by WebVR technology as part of its Social Mixed Reality initiative.

Following organizational changes in 2024, Mozilla discontinued all virtual reality projects—including Mozilla Hubs—effective May 31, 2024.

Mozilla Persona

Mozilla Persona served as a secure authentication system compatible across browsers that allowed users to sign into various websites using a single set of credentials. The service was officially retired on November 30, 2016.

Mozilla Location Service

Introduced in 2013, this free geolocation platform relied on crowdsourced data and offered an open API. In March 2024, Mozilla announced plans to gradually phase out MLS with complete archiving scheduled for July 2024.

Webmaker

Mozilla Webmaker represents an educational program aimed at transforming users from passive web consumers into active creators. Aligned with Mozilla’s nonprofit goals, Webmaker promotes digital literacy and empowers individuals to manage their online identities.

MDN Web Docs

Mozilla manages MDN Web Docs, an extensive resource hub for developers covering web standards such as HTML, CSS, SVG, and JavaScript, along with content specific to Mozilla technologies. Additionally, Mozilla produces numerous instructional videos related to web development and its projects through the Air Mozilla platform (now known as MDN Plus).

Common Voice

Initiated in July 2017, Mozilla's Common Voice initiative strives to make voice recognition technology widely accessible. Participants contribute by sharing their voice recordings, which aids in developing a free software speech recognition engine available for integration into applications and websites. The platform also allows users to verify the recordings submitted by others, thereby improving the overall quality of the dataset.

Mozilla distributes the Common Voice datasets under a CC-0 license, fostering open innovation within the voice recognition field.

IRL – Online Life Is Real Life

On June 26, 2017, Mozilla launched the podcast IRL – Online Life Is Real Life, which delves into social issues related to the internet through engaging web narratives. This project underscores Mozilla’s dedication to promoting digital literacy and creating positive social impact.

Directory Tiles

In February 2014, Mozilla introduced Directory Tiles, a feature that presented advertisements based on Firefox users' browsing activity with opt-in as the default setting. Following user concerns about privacy, Mozilla discontinued this feature in December 2015 while exploring different revenue strategies.

Looking Glass Add-on

On December 15, 2017, Mozilla preloaded the "Looking Glass" extension in Firefox Quantum browsers as part of a partnership with the TV series Mr. Robot. The add-on was installed without obtaining user permission, leading to criticism. Mozilla issued an apology on December 18 and publicly released the add-on’s source code to ensure transparency.

Cliqz Search Engine

In October 2017, Mozilla rolled out an experimental add-on powered by Cliqz technology, which was deployed to under one percent of Firefox users in Germany. The add-on delivered search results influenced by users’ browsing history, which raised privacy-related concerns.

Push Notifications for Mozilla Blog Without User Consent

In July 2020, Mozilla sent unsolicited push notifications promoting a blog post about Facebook and the #StopHateForProfit campaign without user approval. This marketing approach triggered negative reactions from Firefox users.

Federal Labor Charges

In January 2025, Mozilla resolved allegations filed by the National Labor Relations Board concerning its refusal to employ software engineer and labor advocate Cher Scarlett, linked to her activism in 2021. The settlement included a payment of $300,000 for lost wages and benefits, employee notifications regarding rights and the settlement terms, and a commitment to avoid retaliation. The complaint was initially lodged in 2022 and prosecuted during 2023.

Mozilla Monitor collaborated with OneRep to submit data removal requests targeting online directories and data brokers. On March 14, 2024, an investigation by Krebs on Security disclosed that OneRep’s founder had previously established several people-search enterprises. Mozilla responded by stating, "We were aware of these past connections... and were assured they had ceased before our collaboration began. We are currently examining this matter further. Protecting our customers’ privacy and security remains our top priority.” Shortly thereafter, Mozilla’s Vice President of Communications informed The Verge that their partnership with OneRep had been ended.

Nonetheless, in February 2025, Krebs on Security reported that Mozilla continued to utilize and endorse OneRep services.

Discrimination lawsuit

In June 2024, Steve Teixeira, who was serving as Mozilla Corporation's Chief Product Officer, initiated legal action alleging discrimination and retaliation following a three-month medical leave for cancer treatment. Teixeira contended that Mozilla attempted to demote or dismiss him based on unjustified doubts regarding his professional abilities as a person managing cancer.

NOYB complaint

In September 2024, NOYB submitted a formal grievance to Austria's data protection authority targeting Mozilla’s experimental Firefox feature named "Privacy Preserving Attribution." Although this feature aimed to evaluate advertising effectiveness without gathering personal information, it faced accusations of tracking users without their consent and breaching the GDPR.

Terms of Use and Privacy Policy changes

During 2025, Mozilla encountered criticism after revising Firefox’s Terms of Use to include a provision granting the company a "nonexclusive, royalty-free, worldwide license" to utilize data uploaded or entered into the browser. Critics expressed concern that this amendment might undermine user privacy and related it to potential AI data exploitation; however, Mozilla denied these assertions. The company emphasized that the update did not transfer ownership of user data but rather sought to enhance clarity, transparency, and formally document pre-existing agreements tied to providing a free browser. AI-related functionalities were governed under a distinct agreement.

In response to public concern, Mozilla updated its privacy FAQ by removing the explicit promise never to "sell your personal data" and modifying statements that previously denied any data sales. The revised FAQ acknowledged the collection of certain information from ads that can be hidden and metadata from chatbots, noting that legal interpretations of "selling" vary depending on jurisdiction.

Community

The Mozilla Community consists of more than 40,000 engaged contributors worldwide, including both salaried staff and volunteers dedicated to advancing the principles outlined in the Mozilla Manifesto. Numerous sub-groups concentrate on localizing Mozilla Firefox and other web properties operated by Mozilla.

Local communities

Various regionally based sub-communities collaborate on efforts such as localization, marketing, public relations, and user assistance.

In 2017, Mozilla introduced the Wireless Innovation for Network Security (WINS) challenge, which awarded $2 million to innovators working on decentralized wireless technologies aimed at restoring internet connectivity after disasters and improving access for underserved populations.

Mozilla Reps

The volunteer-driven Mozilla Reps program allowed individuals aged 18 and older to officially represent Mozilla by recruiting new contributors, organizing workshops, and participating in summits. This program concluded its activities in 2023.

Mozilla Festival

MozFest is a hybrid gathering that blends art, technology, and social activism. In 2021, it attracted nearly 10,000 virtual attendees from over 87 countries. The festival serves as a significant platform for global initiatives centered on human rights, climate justice, and trustworthy artificial intelligence.

Extending over two weeks, MozFest hosts more than 500 interactive sessions such as presentations, hackathons, exhibitions, and roundtables. Topics include privacy protection strategies, combating misinformation and online harassment, developing free software tools, and promoting advancements in Trustworthy AI. The event’s core themes emphasize freedom and an open Web.

MozCamps

MozCamps consisted of several-day gatherings aimed at growing Mozilla's contributor base through a variety of lectures, workshops, and interactive sessions facilitated by both staff members and volunteers. While these events were once hosted worldwide, no MozCamps have been organized since 2014.

Mozilla Summit

The Mozilla Summit served as a prominent international conference that brought together contributors and employees to synchronize efforts around Mozilla's core mission. In 2013, the Summit attracted more than 2,000 attendees representing 90 countries and speaking 114 different languages, with meetings held in Santa Clara, Toronto, and Brussels. The final Summit took place in 2017, after which Mozilla transitioned to smaller-scale All Hands meetings to foster collaboration among its team and volunteers.

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