Firefox OS was publicly demonstrated in February 2012, on Android-compatible smartphones. By December 16, 2014, fourteen operators in 28 countries throughout the world offered Firefox OS phones.
On December 8, 2015, Mozilla announced that it would stop sales of Firefox OS smartphones through carriers. Mozilla later announced that Firefox OS smartphones would be discontinued by May 2016, as the development of "Firefox OS for smartphones" would cease after the release of version 2.6. Around the same time, it was reported that Acadine Technologies, a startup founded by Li Gong (former president of Mozilla Corporation) with various other former Mozilla staff among its employees, would take over the mission of developing carrier partnerships, for its own Firefox OS derivative H5OS.
In 2012, Andreas Gal expanded on Mozilla's aims. He characterized the current set of mobile operating systems as "walled gardens" and presented Firefox OS as more accessible: "We use completely open standards and there’s no proprietary software or technology involved." (That changed in 2014; see Digital rights management (DRM), below.) Gal also said that because the software stack is entirely HTML5, there are already a large number of established developers. This assumption is employed in Mozilla's WebAPI. These are intended W3C standards that attempt to bridge the capability gap that currently exists between native frameworks and web applications. The goal of these efforts is to enable developers to build applications using WebAPI which would then run in any standards compliant browser without the need to rewrite their application for each platform.
In July 2012, Boot to Gecko was rebranded as 'Firefox OS', after Mozilla's well-known desktop browser, Firefox, and screenshots began appearing in August 2012.
In September 2012, analysts Strategy Analysts forecast that Firefox OS would account for 1% of the global smartphone market in 2013, its first year of commercial availability.
In February 2013, Mozilla announced plans for its global commercial roll-out of Firefox OS.
Mozilla announced at a press conference before the start of Mobile World Congress in Barcelona that the first wave of Firefox OS devices would be available to consumers in Brazil, Colombia, Hungary, Mexico, Montenegro, Poland, Serbia, Spain and Venezuela. Mozilla also announced that LG Electronics, ZTE, Huawei and TCL Corporation had committed to making Firefox OS devices.
Async Pan and Zoom (APZ), included in version 1.3, should improve user interface responsiveness.
Work was done to optimize Firefox OS to run a 128 MB platform with version 1.3T. A 128 MB device is out that seems to use that version but it may be unfinished.
Firefox OS was discontinued in January 2017.
In 2014, Gal announced a change in course, writing that future versions of the Firefox browser would include digital rights management (DRM). Implementation of DRM in the Firefox browser began with version 38.
In December 2012, Mozilla rolled out another update and released Firefox OS Simulator 1.0, which can be downloaded as an add-on for Firefox. The latest version of Firefox OS Simulator, version 4.0, was released on July 3, 2013 and announced on July 11, 2013.
Gaia was the user interface of Firefox OS and controlled everything drawn to the screen. Gaia included by default implementations of a lock screen, home screen, telephone dialer and contacts application, text-messaging application, camera application and gallery support, plus the classic phone apps: mail, calendar, calculator and marketplace. Gaia was written entirely in HTML, CSS, and JavaScript. It interfaced with the operating system through Open Web APIs, which were implemented by Gecko. Because it used only standard web APIs, it could work on other OSes and other web browsers.
B2G OS was forked from Firefox OS following Mozilla's decision to discontinue support for their mobile operating system. The decision was made, according to Ari Jaaksi and David Bryant, in order to "evolve quickly and enable substantial new architectural changes in Gecko, Mozilla’s Platform Engineering organization needs to remove all B2G-related code from mozilla-central."
As of 2017[update], B2G OS is no longer maintained.
Capyloon is a modern fork of Firefox OS started in 2022 which additionally makes use of decentralized web technologies such as IPFS.
Firefox OS used the Linux kernel like Android does. Firefox OS used the Gecko engine on top of the Linux kernel to render the screen output. Apps were written using HTML5, CSS, and JavaScript—all three being cooperative languages used in making internet webpages. In essence, apps on Firefox OS were web apps and the OS could be thought of as a Web browser that stored content off-line. On the other hand, Android's apps are coded in Java using Android Studio. Android also enjoys greater maturity and support. Despite these differences, Firefox OS did feature all the essentials required to use a smartphone. Firefox launched its first official device in Germany in 2014, which was an Alcatel One Touch Fire. The device had a 3.5” HVGA screen, Cortex A5 processor, 256MB RAM, and 512MB storage. As of December 2015[update], Mozilla had launched 12 smartphones across 24 countries.
Ben Francis, an engineer on the Boot to Gecko and Firefox OS projects, described the changes in direction of the project from open web technologies for app development, to cheap smartphones, to connected devices; and how evaluation of its success was reduced to its market share as a third smartphone platform (after Android and iOS).
The structural similarities between Firefox OS and Android allow the Mozilla platform to run on a number of devices that ship with Android. While some ports of Firefox OS are hardly different from their original versions, others are heavily modified to fit the device in question. There are quite a few to note that are specifically made for Firefox OS as stated above. There are some that are designed for the developers themselves and others that are consumer-phones. There are also emulators for testing both apps and the OS itself on the desktop which are designed for both OS testing and the developers themselves.
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