Adobe Flash Player is a runtime that executes and displays content from a provided SWF file, although it has no in-built features to modify the SWF file at runtime. It can execute software written in the ActionScript programming language which enables the runtime manipulation of text, data, vector graphics, raster graphics, sound, and video. The player can also access certain connected hardware devices, including the web cameras and microphones, after permission for the same has been granted by the user.
Although code written in ActionScript 3 executes up to 10 times faster than the prior ActionScript 2, the Adobe ActionScript 3 compiler is a non-optimizing compiler, and produces inefficient bytecode in the resulting SWF, when compared to toolkits such as CrossBridge.
Adobe has released ActionScript Compiler 2 (ASC2) in Flex 4.7 and onwards, which improves compilation times and optimizes the generated bytecode and supports method inlining, improving its performance at runtime.
Flash Player applications and games can be built in two significantly different methods:
In both methods, developers can access the full Flash Player set of functions, including text, vector graphics, bitmap graphics, video, audio, camera, microphone, and others. AIR also includes added features such as file system integration, native extensions, native desktop integration, and hardware integration with connected devices.
Adobe offers the free Adobe Gaming SDK, consisting (as of August 2014) of several open-source AS3 libraries built on the Flash Player Stage3D APIs for GPU-accelerated graphics:
On February 22, 2012, Adobe announced that it would no longer release new versions of NPAPI Flash plugins for Linux, although Flash Player 11.2 would continue to receive security updates. In August 2016, Adobe announced that, beginning with version 24, it would resume offering of Flash Player for Linux for other browsers.
The Extended Support Release (ESR) of Flash Player on macOS and Windows was a version of Flash Player kept up to date with security updates, but none of the new features or bug fixes available in later versions. In August 2016, Adobe discontinued the ESR branch and instead focused solely on the standard release.
Release history for Version 10 can be run under Windows 98/Me using KernelEx. HP offered Version 6 of the player for HP-UX, while Innotek GmbH offered versions 4 and 5 for OS/2. Other versions of the player have been available at some point for BeOS.
In 2011, Flash Player had emerged as the de facto standard for online video publishing on the desktop, with adaptive bitrate video streaming, DRM, and fullscreen support. On mobile devices, however, after Apple refused to allow the Flash Player within iOS's integrated web browser, Adobe changed its strategy, enabling Flash content to be delivered as native mobile applications using the Adobe Integrated Runtime.
Adobe announced on July 25, 2017, that it would end support for the normal/global variant of Flash Player on January 1, 2021, and encouraged developers to use HTML5 standards in place of Flash. The announcement was coordinated with Apple, Facebook, Google, Microsoft, and Mozilla. Adobe announced that all major web browsers planned to officially remove the Adobe Flash Player component on December 31, 2020, and Microsoft removed it from the Windows OS in January 2021 via Windows Update. In a move to further reduce the number of Flash Player installations, Adobe added a "time bomb" to Flash to disable existing installations after January 12, 2021. In mid-2020, Flash Player started prompting users to uninstall itself. Adobe removed all existing download links for Flash installers. After January 26, 2021, all major web browsers including Apple Safari, Google Chrome, Microsoft Edge, and Mozilla Firefox have already permanently removed Flash support. However, Flash content continues to be accessible on the web through emulators such as Ruffle, with varying degrees of compatibility and performance, although this is not endorsed by Adobe.
Starting from Chrome 76, Flash is disabled by default without any prompts to activate Flash content. Users who wanted to play Flash content had to manually set a browser to prompt for Flash content, and then during each browser session, enable Flash plugin for every site individually. Microsoft Edge, which is based on Chromium, followed the same plan as Google Chrome.
Google Chrome blocked the Flash plugin as "out of date" in January 2021, and fully removed it from the browser with Chrome version 88, released on January 20, 2021.
Starting with Firefox 85, Flash is disabled by default without any prompts to activate Flash content. To play Flash content, users had to manually set a browser to prompt for Flash content, and then during each browser session enable Flash plugin for every site individually. Firefox 85, released on January 26, 2021, completely removed support for the Flash plugin. Firefox ESR dropped support on November 2, 2021 (Firefox 78 ESR was the last version with support).
On October 27, 2020, Microsoft released an update (named KB4577586) for Windows 10 and 8.1 which removes the embedded Adobe Flash Player component from IE11 and Edge Legacy. In July 2021, this update was automatically installed as a security patch. However, an ActiveX Flash Player plugin may still be used with IE after this update is applied.
Despite the years of notice, several websites still were using Flash following December 31, 2020, including the U.S. Securities and Exchange Commission. Many of these were resolved in the weeks after the deadline. However, many educational institutions still relied on Flash for educational material and did not have a path forward for replacement.
The China-specific variant of Flash is still supported, by a company known as Zhongcheng. The Projector (standalone) versions of this variant also work outside of China and do not include the "Flash Helper Service"; however, some tracking code still seems to be present. They are available on a somewhat hidden "Debug" page. In addition, as the global variant of the plugin was discontinued, some users have figured how to modify and repack the China-specific variant to bring it more in line with the global variant. This includes removing the "Flash Helper Service" and removing the China only installation restriction, along with all other geo-restrictions and tracking code. A "time bomb", similar to the one found in later versions of the global variant, is also present in the unmodified China variant; this is also removed in most repacks. In theory, these repacks should provide users outside of China with the latest security updates to Flash Player, without having to deal with invasive advertisements or worry about privacy risks. One such project, "Clean Flash Installer", was served a DMCA takedown from Adobe in October 2021.
Although no longer available directly from Adobe, all versions of Adobe Flash Player Projector (also known as Adobe Flash Player Standalone) lack the "time bomb" present in the newer plug-in variants, and thus continue to be able to play all supported Flash file formats, including SWF files, without modification.
In some browsers, prior Flash versions have had to be uninstalled before an updated version could be installed. However, as of version 11.2 for Windows, there are now automatic updater options. Linux is partially supported, as Adobe is cooperating with Google to implement it via Chrome web browser on all Linux platforms.
Mixing Flash applications with HTML leads to inconsistent input handling leading to poor user experience with the site (keyboard and mouse not working as they would in an HTML-only document).
Because local storage can be used to save information on a computer that is later retrieved by the same site, a site can use it to gather user statistics, similar to how HTTP cookies and Web Storage can be used. With such technologies, the possibility of building a profile based on user statistics is considered by some a potential privacy concern. Users can disable or restrict use of local storage in Flash Player through a "Settings Manager" page. These settings can be accessed from the Adobe website or by right-clicking on Flash-based content and selecting "Global Settings".
Local storage can be disabled entirely or on a site-by-site basis. Disabling local storage will block any content from saving local user information using Flash Player, but this may disable or reduce the functionality of some websites, such as saved preferences or high scores and saved progress in games.
Adobe security bulletins and advisories announce security updates, but Adobe Flash Player release notes do not disclose the security issues addressed when a release closes security holes, making it difficult to evaluate the urgency of a particular update. A version test page allows the user to check if the latest version is installed, and uninstallers may be used to ensure that old-version plugins have been uninstalled from all installed browsers.
In February 2010, Adobe officially apologized for not fixing a known vulnerability for over a year. In June 2010 Adobe announced a "critical vulnerability" in recent versions, saying there are reports that this vulnerability is being actively exploited in the wild against both Adobe Flash Player, and Adobe Reader and Acrobat. Later, in October 2010, Adobe announced another critical vulnerability, this time also affecting Android-based mobile devices. Android users have been recommended to disable Flash or make it only on demand. Subsequent security vulnerabilities also exposed Android users, such as the two critical vulnerabilities published in February 2013 or the four critical vulnerabilities published in March 2013, all of which could lead to arbitrary code execution.
Steve Jobs criticized the security of Flash Player, noting that "Symantec recently highlighted Flash for having one of the worst security records in 2009." Adobe responded by pointing out that "the Symantec Global Internet Threat Report for 2009, found that Flash Player had the second lowest number of vulnerabilities of all Internet technologies listed (which included both web plug-ins and browsers)."
Flash Player 11.2 does not play certain kinds of content unless it has been digitally signed by Adobe, following a license obtained by the publisher directly from Adobe.
This move by Adobe, together with the abandonment of Flex to Apache was criticized as a way to lock out independent tool developers, in favor of Adobe's commercial tools.
This has been resolved as of January 2013, after Adobe no longer requires a license or royalty from the developer. All premium features are now classified as general availability, and can be freely used by Flash applications.
Steve Jobs also claimed that a large percentage of the video on the Internet is supported on iOS, since many popular video sharing websites such as YouTube have published video content in an HTML5 compatible format, enabling videos to playback in mobile web browsers even without Flash Player.
Starting with version 30, Adobe stopped distributing Flash Player directly to users from mainland China. Instead, they selected 2144.cn as a partner and released a special variant of Flash Player on a specific website, which contains a non-closable process, known as the "Flash Helper Service", that collects private information and pops up advertisement window contents, by receiving and running encrypted programs from a remote server. The partnership started in about 2017, but in version 30, Adobe disabled the usage of vanilla (global) variant of Flash Player in mainland China, forcing users to use that specific variant, which may pose a risk to its users due to Internet censorship by the Chinese Communist Party (CCP). This only affected Chinese Chromium based browser users, Firefox users, and Internet Explorer users using Windows 7 and below, as Microsoft still directly distributed Flash Player for Internet Explorer and Microsoft Edge Legacy through Windows Update in Windows 8 and upward at the time. Starting in 2021, however, this variant is the only publicly supported version of Flash Player.
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Except in China, where it continues to be used, as well as Harman for enterprise users.
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