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68-413: Web development tools come as browser add-ons or built-in features in modern web browsers. Browsers such as Google Chrome, Firefox , Safari , Microsoft Edge , and Opera have built-in tools to help web developers, and many additional add-ons can be found in their respective plugin download centers. Web development tools allow developers to work with a variety of web technologies, including HTML , CSS ,

136-502: A Chromium -based browser. (Chromium is Google's open-source project that serves as the functional core of Chrome and many other browsers.) Now that Edge has the same API as Chrome, extensions can be installed directly from the Chrome Web Store. In 2015, Mozilla announced that the long-standing XUL and XPCOM extension capabilities of Firefox would be replaced with a less-permissive API very similar to Chrome's. This change

204-537: A Metro-style version of Firefox, optimized for touchscreen use, on the "Aurora" release channel. However, on March 14, 2014, Mozilla cancelled the project because of a lack of user adoption. In March 2017, Firefox 52 ESR, the last version of the browser for Windows XP and Windows Vista , was released. Support for Firefox 52 ESR ended in June 2018. Traditionally, installing the Windows version of Firefox entails visiting

272-522: A blacklist and whitelist of sites that will be used in the filter. Version 23, released in August 2013, followed the lead of its competitors by blocking iframe , stylesheet, and script resources served from non-HTTPS servers embedded on HTTPS pages by default. Additionally, JavaScript could also no longer be disabled through Firefox's preferences, and JavaScript was automatically re-enabled for users who upgraded to 23 or higher with it disabled. The change

340-422: A screenshot tool, web development tools , a "page info" feature which shows a list of page metadata and multimedia items, a configuration menu at about:config for power users , and location-aware browsing (also known as " geolocation ") based on a Google service. Firefox has an integrated search system which uses Google by default in most markets. DNS over HTTPS is another feature whose default behaviour

408-544: A desktop browser), making it the fourth-most popular PC web browser after Google Chrome (65%), Microsoft Edge (13%), and Safari (9.0%). The project began as an experimental branch of the Mozilla project by Dave Hyatt , Joe Hewitt , and Blake Ross . They believed the commercial requirements of Netscape 's sponsorship and developer-driven feature creep compromised the utility of the Mozilla browser. To combat what they saw as

476-532: A model, permissions, and a common core of APIs". However, Google joined this during its overhaul of Chrome's extension API, known as Manifest V3 , which greatly reduces the capability of ad blockers and privacy -related extensions. Thus the WebExtensions group is viewed by some extension developers as nothing more than Google imposing its Manifest V3 design. Browser extensions typically have access to sensitive data, such as browsing history , and they have

544-467: A new extension system that is designed to be similar to Chrome and other recent browsers. Firefox 57, which was released in November 2017, was the first version to contain enhancements from Quantum, and has thus been named Firefox Quantum . A Mozilla executive stated that Quantum was the "biggest update" to the browser since version 1.0. Unresponsive and crashing pages only affect other pages loaded within

612-594: A new project called Servo to write a completely new and experimental browser engine utilizing memory safe techniques written in Rust . In 2018, Mozilla opted to integrate parts of the Servo project into the Gecko engine in a project codenamed the Quantum project. The project completely overhauled Firefox's page rendering code resulting in performance and stability gains while also improving

680-506: A project known as Quantum , which sought to improve Firefox's Gecko engine and other components to improve the browser's performance, modernize its architecture, and transition the browser to a multi-process model. These improvements came in the wake of decreasing market share to Google Chrome , as well as concerns that its performance was lapsing in comparison. Despite its improvements, these changes required existing add-ons for Firefox to be made incompatible with newer versions, in favor of

748-497: A randomized device ID to prevent services from uniquely identifying the device for tracking purposes. The DRM module, once it has been downloaded, is enabled, and disabled in the same manner as other plug-ins . Since version 47, "Google's Widevine CDM on Windows and Mac OS X so streaming services like Amazon Video can switch from Silverlight to encrypted HTML5 video" is also supported. Mozilla justified its partnership with Adobe and Google by stating: Firefox downloads and enables

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816-531: A variety of extensions, including user interface modifications, cookie management, ad blocking , and the custom scripting and styling of web pages . Browser plug-ins are a different type of module and no longer supported by the major browsers. One difference is that extensions are distributed as source code , while plug-ins are executables (i.e. object code ). The most popular browser, Google Chrome , has over 100,000 extensions available but stopped supporting plug-ins in 2020. Internet Explorer

884-456: A video call, with the extra feature of screen and file sharing by sending a link to each other. Firefox Hello was scheduled to be removed in September 2016. Former features include a File Transfer Protocol (FTP) client for browsing file servers, the ability to block images from individual domains (until version 72), a 3D page inspector (versions 11 to 46), tab grouping (until version 44), and

952-662: A web page used too many resources, the entire Firefox process would hang or crash, affecting all tabs. Additionally, any exploit could easily access system resources, including user files. Between 2008 and 2012, most browsers shifted to a multiprocess architecture, isolating high-risk processes like rendering, media, GPU, and networking. However, Firefox was slower to adopt this change. It wasn't until 2015 that Firefox started its Electrolysis (e10s) project to implement sandboxing across multiple components. This rewrite relied on interprocess communication using Chromium 's interprocess communication library and placed various component including

1020-447: Is 0, DoH is disabled; 1 activates DoH in addition to unencrypted DNS; 2 causes DoH to be used before unencrypted DNS; to use only DoH, the value must be 3. By setting network.trr.uri to the URL, special Cloudflare servers will be activated. Mozilla has a privacy agreement with this server host that restricts their collection of information about incoming DNS requests. On May 21, 2019, Firefox

1088-468: Is also available on the Amazon Fire TV as one of the two main browsers available with Amazon's Silk Browser . Firefox is the spiritual successor of Netscape Navigator , as the Mozilla community was created by Netscape in 1998, before its acquisition by AOL . Firefox was created in 2002 under the codename "Phoenix" by members of the Mozilla community who desired a standalone browser rather than

1156-496: Is available for Windows 10 and later versions of Windows , macOS , and Linux . Its unofficial ports are available for various Unix and Unix-like operating systems, including FreeBSD , OpenBSD , NetBSD , and other platforms. It is also available for Android and iOS . However, as with all other iOS web browsers, the iOS version uses the WebKit layout engine instead of Gecko due to platform requirements. An optimized version

1224-432: Is available for Android (formerly Firefox for mobile, it also ran on Maemo , MeeGo and Firefox OS ) and Firefox for iOS is available for iOS. Smartphones that support Linux but not Android, or iOS apps can also run Firefox in its desktop version, for example using postmarketOS . Notes Firefox source code may be compiled for various operating systems; however, officially distributed binaries are provided for

1292-492: Is commonly included in the built-in web development tools. The difference between the HTML and DOM viewer, and the view source feature in web browsers is that the HTML and DOM viewer allows you to see the DOM as it was rendered in addition to allowing you to make changes to the HTML and DOM and see the change reflected in the page after the change is made. In addition to selecting and editing,

1360-460: Is commonly used in web browsers. Web development tools commonly include a debugger panel for scripts by allowing developers to add watch expressions, breakpoints, view the call stack, and pause, continue, and step while debugging JavaScript. A console is also often included, which allow developers to type in JavaScript commands and call functions, or view errors that may have been encountered during

1428-578: Is determined geographically. Firefox provides an environment for web developers in which they can use built-in tools, such as the Error Console or the DOM Inspector , and extensions , such as Firebug and more recently there has been an integration feature with Pocket . Firefox Hello was an implementation of WebRTC , added in October 2014, which allows users of Firefox and other compatible systems to have

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1496-404: Is entered. Firefox now supports HTTP/2. In February 2013, plans were announced for Firefox 22 to disable third-party cookies by default. However, the introduction of the feature was then delayed so Mozilla developers could "collect and analyze data on the effect of blocking some third-party cookies." Mozilla also collaborated with Stanford University 's "Cookie Clearinghouse" project to develop

1564-463: Is often abbreviated as FF . The Firefox project went through many versions before version 1.0 and had already gained a great deal of acclaim from numerous media outlets, such as Forbes and The Wall Street Journal . Among Firefox's popular features were the integrated pop-up blocker , tabbed browsing , and an extension mechanism for adding functionality. Although these features have already been available for some time in other browsers such as

1632-621: The Acid3 test fully because they believed that the SVG fonts part of the test had become outdated and irrelevant, due to WOFF being agreed upon as a standard by all major browser makers. Because the SVG font tests were removed from the Acid3 test in September 2011, Firefox 4 and greater scored 100/100. Firefox also implements "Safe Browsing," a proprietary protocol from Google used to exchange data related with phishing and malware protection. Firefox supports

1700-460: The DOM , JavaScript , and other components that are handled by the web browser. Early web developers manually debugged their websites by commenting out code and using JavaScript functions. One of the first browser debugging tools to exist was Mozilla 's Firebug extension, which possessed many of the current core features of today's developer tools, leading to Firefox becoming popular with developers at

1768-504: The Firebird database software project. The Mozilla Foundation reassured them that the browser would always bear the name Mozilla Firebird to avoid confusion. After further pressure, Mozilla Firebird became Mozilla Firefox on February 9, 2004. The name Firefox was said to be derived from a nickname of the red panda , which became the mascot for the newly named project. For the abbreviation of Firefox, Mozilla prefers Fx or fx, although it

1836-492: The Mozilla Application Suite bundle. During its beta phase, it proved to be popular with its testers and was praised for its speed, security, and add-ons compared to Microsoft 's then-dominant Internet Explorer 6 . It was released on November 9, 2004, and challenged Internet Explorer 's dominance with 60 million downloads within nine months. In November 2017, Firefox began incorporating new technology under

1904-694: The Mozilla Suite and Opera , Firefox was the first of these browsers to have achieved large-scale adoption. Firefox attracted attention as an alternative to Internet Explorer , which had come under fire for its alleged poor program design and insecurity—detractors cite IE's lack of support for certain Web standards, use of the potentially dangerous ActiveX component, and vulnerability to spyware and malware installation. Microsoft responded by releasing Windows XP Service Pack 2, which added several important security features to Internet Explorer 6. Version 1.0 of Firefox

1972-521: The Mozilla Suite 's software bloat , they created a standalone browser, with which they intended to replace the Mozilla Suite. Version 0.1 was released on September 23, 2002. On April 3, 2003, the Mozilla Organization announced that it planned to change its focus from the Mozilla Suite to Firefox and Thunderbird . The Firefox project has undergone several name changes. The nascent browser

2040-551: The WHATWG such as client-side storage, and the canvas element . These standards are implemented through the Gecko layout engine, and SpiderMonkey JavaScript engine. Firefox 4 was the first release to introduce significant HTML5 and CSS3 support. Firefox has passed the Acid2 standards-compliance test since version 3.0. Mozilla had originally stated that they did not intend for Firefox to pass

2108-675: The Adobe Primetime and Google Widevine CDMs by default to give users a smooth experience on sites that require DRM. Each CDM runs in a separate container called a sandbox and you will be notified when a CDM is in use. You can also disable each CDM and opt-out of future updates and that it is "an important step on Mozilla's roadmap to remove NPAPI plugin support." Upon the introduction of EME support, builds of Firefox on Windows were also introduced that exclude support for EME. The Free Software Foundation and Cory Doctorow condemned Mozilla's decision to support EME. From its inception, Firefox

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2176-479: The Firefox website and downloading an installer package, depending on the desired localization and system architecture. In November 2021, Mozilla made Firefox available on Microsoft Store . The Store-distributed package does not interfere with the traditional installation. Browser extension A browser extension is a software module for customizing a web browser . Browsers typically allow users to install

2244-439: The HTML elements panels will usually also display properties of the DOM object, such as display dimension, and CSS properties. Firefox, Safari, Chrome, and Edge all allow users to simulate the document on a mobile device by modifying the viewport dimensions and pixel density . Additionally, Firefox and Chrome both have the option to simulate colour blindness for the page. Web pages typically load and require additional content in

2312-467: The Servo team transferring ownership of the project to the Linux Foundation . When Firefox initially released, it used a custom script permission policy where scripts that were signed by the page could gain access to higher privilege actions such as the ability to set a user's preferences. However, this model was not widely used and was later discontinued by Firefox. Modern day Firefox instead follows

2380-524: The ability to add customized extra toolbars (until version 28). Functions can be added through add-ons created by third-party developers . Add-ons are primarily coded using an HTML , CSS , JavaScript , with API known as WebExtensions , which is designed to be compatible with Google Chrome and Microsoft Edge extension systems. Firefox previously supported add-ons using the XUL and XPCOM APIs, which allowed them to directly access and manipulate much of

2448-569: The ability to alter some browser settings, add user interface items, or replace website content. As a result, there have been instances of malware , so users need to be cautious about what extensions they install. There have also been cases of applications installing browser extensions without the user's knowledge , making it hard for the user to uninstall the unwanted extension. Some Google Chrome extension developers have sold their extensions to third-parties who then incorporated adware . In 2014, Google removed two such extensions from

2516-721: The appearance of the browser. In 2013, Firefox for Android added a guest session mode, which wiped browsing data such as tabs, cookies, and history at the end of each guest session. Guest session data was kept even when restarting the browser or device, and deleted only upon a manual exit. The feature was removed in 2019, purportedly to " streamline the experience ". Firefox implements many web standards , including HTML4 (almost full HTML5 ), XML , XHTML , MathML , SVG 1.1 (full), SVG 2 (partial), CSS (with extensions), ECMAScript ( JavaScript ), DOM , XSLT , XPath , and APNG (Animated PNG ) images with alpha transparency . Firefox also implements standards proposals created by

2584-533: The browser's internal functionality. As compatibility was not included in the multi-process architecture, XUL add-ons have been deemed Legacy add-ons and are no longer supported on Firefox 57 "Quantum" and newer. Mozilla has occasionally installed extensions for users without their permission. This happened in 2017 when an extension designed to promote the show Mr. Robot was silently added in an update to Firefox. Firefox can have themes added to it, which users can create or download from third parties to change

2652-437: The code name " Quantum " to promote parallelism and a more intuitive user interface . Firefox usage share grew to a peak of 32.21% in November 2009, with Firefox 3.5 overtaking Internet Explorer 7 , although not all versions of Internet Explorer as a whole; its usage then declined in competition with Google Chrome . As of July 2024 , according to StatCounter , it had a 6.5% usage share on traditional PCs (i.e. as

2720-526: The corresponding key-value pairs reportedly stopped working in later builds, resulting in criticism. These included accessibility concerns despite Mozilla's claim to "continue to work with the accessibility community" and had not been resolved as of October 2024 . On January 13, 2022, an issue with Firefox's HTTP/3 implementation resulted in a widespread outage for several hours. On September 26, 2023, Firefox 118.0 introduced on-device translation of web page content. On January 23, 2024, along with

2788-423: The developer tools for testing purposes. Beginning with Firefox 48, all extensions must be signed by Mozilla to be used in release and beta versions of Firefox. Firefox 43 blocked unsigned extensions but allowed enforcement of extension signing to be disabled. All extensions must be submitted to Mozilla Add-ons and be subject to code analysis in order to be signed, although extensions do not have to be listed on

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2856-539: The execution of a script. The devtools API allows browser extensions to add their own features to developer tools. Firefox Mozilla Firefox is a free and open source web browser developed by the Mozilla Foundation and its subsidiary, the Mozilla Corporation . It uses the Gecko rendering engine to display web pages, which implements current and anticipated web standards. Firefox

2924-474: The following: Firefox 1.0 was released for Windows 95 , as well as Windows NT 4.0 or later. Some users reported the 1.x builds were operable (but not installable) on Windows NT 3.51 . The version 42.0 release includes the first x64 build. It required Windows 7 or Server 2008 R2 . Starting from version 49.0, Firefox for Windows requires and uses the SSE2 instruction set. In September 2013, Mozilla released

2992-585: The form of images, scripts, font and other external files. Web development tools also allow developers to inspect resources that are loaded and available on the web page in a tree-structure listing, and the appearance of style sheets can be tested in real time. Web development tools also allow developers to view information about the network usage, such as viewing what the loading time and bandwidth usage are and which HTTP headers are being sent and received. Developers can manipulate and resend network requests. Profiling allows developers to capture information about

3060-557: The in-house Pontoon localization platform. The first official release in November 2004 was available in 24 different languages and for 28 locales . In 2019, Mozilla released Project Fluent a localization system that allows translators to be more flexible with their translation than to be constrained in one-to-one translation of strings. As of November 2024 the supported versions of Firefox are available in 97 locales (88 languages). There are desktop versions of Firefox for Microsoft Windows, macOS, and Linux, while Firefox for Android

3128-471: The make-up of their pages. These are all tools that are built into the browser and do not require additional modules or configuration. The built-in web developer tools in the browser are commonly accessed by hovering over an item on a webpage and selecting the "Inspect Element" or similar option from the context menu . Alternatively the F12 key tends to be another common shortcut. HTML and DOM viewer and editor

3196-627: The operating system, was considered a safer alternative since it was less likely to have issues that could completely compromise a computer. This led to a significant increase in Firefox's popularity during the early 2000s as a more secure alternative. Moreover, Firefox was considered to have fewer actively exploitable security vulnerabilities compared to its competitors. In 2006, The Washington Post reported that exploit code for known security vulnerabilities in Internet Explorer were available for 284 days compared to only nine days for Firefox before

3264-532: The performance of a web page or web application. With this information developers can improve the performance of their scripts. Auditing features may provide developers suggestions, after analyzing a page, for optimizations to decrease page load time and increase responsiveness. Web development tools typically also provide a record of the time it takes to render the page, memory usage, and the types of events which are taking place. These features allow developers to optimize their web page or web application. JavaScript

3332-405: The playback of video content protected by HTML5 Encrypted Media Extensions (EME), since version 38. For security and privacy reasons, EME is implemented within a wrapper of open-source code that allows execution of a proprietary DRM module by Adobe Systems —Adobe Primetime Content Decryption Module (CDM). CDM runs within a " sandbox " environment to limit its access to the system and provide it

3400-476: The problem was fixed. A Symantec study around the same period showed that even though Firefox had a higher number of vulnerabilities, on average vulnerabilities were fixed faster in Firefox than in other browsers during that period. During this period, Firefox used a monolithic architecture , like most browsers at the time. This meant all browser components ran in a single process with access to all system resources . This setup had multiple security issues. If

3468-435: The release of Firefox 122.0, Mozilla introduced an official APT repository for Debian -based Linux distributions . Features of the desktop edition include tabbed browsing , full-screen mode, spell checking , incremental search , smart bookmarks , bookmarking and downloading through drag and drop , a download manager , user profile management, private browsing , bookmark tags, bookmark exporting , offline mode,

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3536-479: The rendering component in its own sandbox. Firefox released this rewrite in to beta in August 2016, noting a 10–20% increase in memory usage, which was lower than Chrome's at the time. However, the rewrite caused issues with their legacy extension API, which was not designed to work cross-process and required shim code to function correctly. After over a year in beta, the rewrite was enabled by default all users of Firefox in November 2017. In 2012, Mozilla launched

3604-405: The roll-out of a fix shortly thereafter, using their Mozilla Studies component. Support for Adobe Flash was dropped on January 6, 2021, with the release of Firefox 85. On June 1, 2021, Firefox's 'Proton' redesign was offered through its stable release channel after being made available in the beta builds. While users were initially allowed to revert to the old design through about:config ,

3672-461: The same or very similar API due to the popularity of Google Chrome . Chrome was the first browser with an extension API based solely on HTML , CSS , and JavaScript . Beta testing for this capability began in 2009, and the following year Google opened the Chrome Web Store . As of June 2012, there were 750 million total installations of extensions and other content hosted on the store. In

3740-551: The same process. While Chrome uses separate processes for each loaded tab, Firefox distributes tabs over four processes by default (since Quantum), in order to balance memory consumption and performance. The process count can be adjusted, where more processes increase performance at the cost of memory, therefore suitable for computers with larger RAM capacity. On May 3, 2019, the expiry of an intermediate signing certificate on Mozilla servers caused Firefox to automatically disable and lock all browser extensions (add-ons). Mozilla began

3808-432: The same year, Chrome overtook Internet Explorer as the world's most popular browser, and its usage share reached 60% in 2018. Because of Chrome's success, Microsoft created a very similar extension API for its Edge browser, with the goal of making it easy for Chrome extension developers to port their work to Edge. But after three years Edge still had a disappointingly small market share, so Microsoft rebuilt it as

3876-542: The security of existing components. Additionally, the older incompatible extension API was removed in favour of a WebExtension API that more closely resembled Google Chrome's extension system. This broke compatibility with older extensions but resulted in lesser vulnerabilities and a much more maintainable extension system. While the Servo project was intended to replace more parts of the Gecko Engine, this plan never came to fruition. In 2020, Mozilla laid off all developers on

3944-581: The service to be signed. On May 2, 2019, Mozilla announced that it would be strengthening the signature enforcement with methods that included the retroactive disabling of old extensions now deemed to be insecure. Since version 60 Firefox includes the option to use DNS over HTTPS (DoH), which causes DNS lookup requests to be sent encrypted over the HTTPS protocol. To use this feature the user must set certain preferences beginning with "network.trr" (Trusted Recursive Resolver) in about:config : if network.trr.mode

4012-447: The standard same-origin policy permission model that is followed by most modern browsers which disallows scripts from accessing any privileged data including data about other websites. It uses TLS to protect communications with web servers using strong cryptography when using the HTTPS protocol. The freely available HTTPS Everywhere add-on enforces HTTPS, even if a regular HTTP URL

4080-524: The time. Safari's WebKit engine also introduced its integrated developer tools around that period, which eventually became the basis for both Safari and Chrome's current tooling. Microsoft released a developer toolbar for Internet Explorer 6 and 7; and then integrated them into the browser from version 8 onwards. In 2017, Mozilla discontinued Firebug in favour of integrated developer tools. Nowadays, all modern web browsers have support for web developer tools that allow web designers and developers to look at

4148-427: The websites users visit. Also known as state partitioning or "total cookie protection", SmartBlock works via a feature in the browser that isolates data from each site visited by the user to ensure that cross-site scripting is very difficult if not impossible. The feature also isolates local storage, service workers and other common ways for sites to store data. Firefox is a widely localized web browser. Mozilla uses

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4216-481: Was enacted in 2017. Firefox extensions are now largely compatible with their Chrome counterparts. Apple was the last major exception to this trend, but support for extensions conforming to the Chrome API was added to Safari for macOS in 2020. Extensions were later enabled in the iOS version for the first time. In 2021, these browser vendors formed a new W3C community group, called WebExtensions, to "specify

4284-432: Was made due to the fact the JavaScript was being used across a majority of websites on the web and disabling JavaScript could potentially have untoward repercussions on inexperienced users who are unaware of its impact. Firefox also cited the fact that extensions like NoScript , that can disable JavaScript in a more controlled fashion, were widely available. The following release added the ability to disable JavaScript through

4352-407: Was originally named Phoenix, after the mythical bird that rose triumphantly from the ashes of its dead predecessor (in this case, from the "ashes" of Netscape Navigator , after it was sidelined by Microsoft Internet Explorer in the " First Browser War "). Phoenix was renamed in 2003 due to a trademark claim from Phoenix Technologies . The replacement name, Firebird, provoked an intense response from

4420-459: Was positioned as a security-focused browser. At the time, Internet Explorer , the dominant browser, was facing a security crisis. Multiple vulnerabilities had been found, and malware like Download.Ject could be installed simply by visiting a compromised website. The situation was so bad that the US Government issued a warning against using Internet Explorer. Firefox, being less integrated with

4488-792: Was released on November 9, 2004. This was followed by version 1.5 in November 2005, version 2.0 in October 2006, version 3.0 in June 2008, version 3.5 in June 2009, version 3.6 in January 2010, and version 4.0 in March 2011. From version 5 onwards, the development and release model changed into a "rapid" one; by the end of 2011 the stable release was version 9, and by the end of 2012 it reached version 17. Major redesigns of its graphical user interface occurred on versions 4.0 ( Strata ) in March 2011, 29.0 ( Australis ) in April 2014, 57.0 ( Photon ) in November 2017, and 89.0 ( Proton ) in June 2021. In 2016, Mozilla announced

4556-573: Was the first major browser to support extensions, with the release of version 4 in 1997. Firefox has supported extensions since its launch in 2004. Opera and Chrome began supporting extensions in 2009, and Safari did so the following year. Microsoft Edge added extension support in 2016. In 2015, a community group formed under the W3C to create a single standard application programming interface (API) for browser extensions. While this particular work did not reach fruition, every major browser now has

4624-453: Was updated to include the ability to block scripts that used a computer's CPU to mine cryptocurrency without a user's permission, in Firefox version 67.0. The update also allowed users to block known fingerprinting scripts that track their activity across the web, however it does not resist fingerprinting on its own. In March 2021, Firefox launched SmartBlock in version 87 to offer protection against cross-site tracking , without breaking

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