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=== Browser extensions === Functions can be added through [[add-on (Mozilla)|add-ons]] created by [[third-party developer]]s. 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.<ref>{{Cite web |title=Browser Extensions |url=https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions |access-date=July 16, 2020 |website=MDN Web Docs |language=en |archive-date=July 19, 2020 |archive-url=https://web.archive.org/web/20200719033959/https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions |url-status=live}}</ref> Firefox previously supported add-ons using the [[XUL]] and [[XPCOM]] APIs, which allowed them to directly access and manipulate much of 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.<ref>{{Cite web |url=https://blog.mozilla.org/addons/2017/08/10/upcoming-changes-compatibility/ |title=Upcoming Changes in Compatibility Features |last=Villalobos |first=Jorge |date=August 10, 2017 |website=Mozilla Add-ons Blog |access-date=December 11, 2017 |archive-url=https://web.archive.org/web/20171226113447/https://blog.mozilla.org/addons/2017/08/10/upcoming-changes-compatibility/ |archive-date=December 26, 2017 |url-status=live}}</ref><ref>{{Cite news |url=https://arstechnica.com/information-technology/2015/08/mozilla-sets-plan-to-dump-firefox-add-ons-move-to-chrome-like-extensions/ |title=Mozilla sets plan to dump Firefox add-ons, move to Chrome-like extensions |last=Bright |first=Peter |date=August 21, 2015 |work=Ars Technica |access-date=December 11, 2017 |archive-url=https://web.archive.org/web/20171201203245/https://arstechnica.com/information-technology/2015/08/mozilla-sets-plan-to-dump-firefox-add-ons-move-to-chrome-like-extensions/ |archive-date=December 1, 2017 |url-status=live}}</ref> 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.<ref>{{cite web |url=https://www.theverge.com/2017/12/16/16784628/mozilla-mr-robot-arg-plugin-firefox-looking-glass |title=Mozilla faces blowback after slipping Mr Robot plugin into Firefox |first=Russell |last=Brandom |publisher=The Verge |date=December 16, 2017 |access-date=August 25, 2022 |archive-date=August 25, 2022 |archive-url=https://web.archive.org/web/20220825145358/https://www.theverge.com/2017/12/16/16784628/mozilla-mr-robot-arg-plugin-firefox-looking-glass |url-status=live }}</ref><ref>{{cite news |url=https://www.theregister.com/2017/12/18/mozilla_mr_robot_firefox_promotion/ |title=Mozilla's creepy Mr Robot stunt in Firefox flops in touching tribute to TV show's 2nd season |first=Shaun |last=Nichols |work=The Register |date=December 18, 2017 |access-date=August 25, 2022 |archive-date=August 25, 2022 |archive-url=https://web.archive.org/web/20220825145031/https://www.theregister.com/2017/12/18/mozilla_mr_robot_firefox_promotion/ |url-status=live }}</ref>
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