{"id":183836,"date":"2026-10-13T16:54:15","date_gmt":"2026-10-13T14:54:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/news\/reliz-firefox-158"},"modified":"2026-10-13T16:54:21","modified_gmt":"2026-10-13T14:54:21","slug":"firefox-158-release","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/news\/firefox-158-release","title":{"rendered":"Firefox 158 Release","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>The release of the Firefox 158 web browser has occurred, and updates for previous long-term support branches \u2014 153.5.0 and 115.43.0 \u2014 have been finalized. Within the new two-week release cycle, the Firefox 159 branch has moved to beta testing, with its release planned for October 27. <\/p>\n<p>Key innovations in Firefox 158 (1, 2, 3):<\/p>\n<ul>\n<li class=\"l\"> JPEG XL image decoding support is enabled by default. The MIME type 'image\/jxl' has been added to the HTTP Accept header. Like in Chrome, the implementation of JPEG-XL in Firefox is based on the jxl-rs library, written in Rust. JPEG XL achieves 30-50% smaller file sizes compared to JPEG images of equivalent quality. Supported extended features include: HDR, animation, transparency, progressive loading mode, smooth degradation of quality at lower bit rates, lossless JPEG compression, support for up to 4099 channels, and a wide range of color depths.\n<li class=\"l\"> The 'Smart Window' mode, which provides a separate interaction space with AI, has added the ability for form auto-filling. When clicking on a field in a web form, the AI suggests options created based on open tabs and previously memorized autofill data. This feature has been activated for a portion of users.\n<li class=\"l\"> In the background settings on the page shown when opening a new tab, the history of all uploaded background images is preserved, not just the most recent one. All images chosen by the user can be viewed in the 'Your images' section.\n<p><center><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/10\/c05257d1050056ca3063cd5e52795578.png\" style=\"display:block;margin: 0 auto;\" \/><\/center><\/p>\n<li class=\"l\"> PDF page saving and printing output have been improved on Linux and macOS. Issues with PDF rendering, such as ignoring mathematical symbols, have been resolved.\n<li class=\"l\"> Translation into Belarusian has been implemented.\n<li class=\"l\"> By applying subpixel scrolling positioning (without rounding to whole screen pixels), scrolling smoothness on high pixel density screens or when zooming the page has been enhanced.\n<li class=\"l\"> Support for typed arithmetic has been added to the CSS function calc(), allowing arithmetic operations that account for specified units of measurement, for example, calc(50vw + 2rem), calc(1000px \/ 2), or calc(40deg + 2rad).\n<li class=\"l\"> In the Notification API and the ServiceWorkerRegistration.showNotification() method, an option named navigate has been added, which defines the URL to navigate to after clicking on the notification.\n<li class=\"l\"> For input elements with the attribute 'autocomplete=\"webauthn\"', a pop-up for passwordless authentication via fingerprint or face recognition has been implemented.\n<li class=\"l\"> Support for the 'cache' value has been added to the PerformanceResourceTiming.deliveryType property to identify resources retrieved from the cache.\n<li class=\"l\"> Support for the WebGL extension EXT_polygon_offset_clamp has been added.\n<li class=\"l\"> In the Android version of Firefox, users can now position the tab list panel at the top or bottom of the window.\n<li class=\"l\"> A new edition of Firefox Enterprise has been created, with its features described in a separate review.\n<\/ul>\n<p>In addition to new features and bug fixes, Firefox 158 has resolved 77 vulnerabilities, 30 of which are rated as high risk. Most vulnerabilities are caused by memory management issues, such as buffer overflows and accessing already freed memory areas. These issues could potentially lead to the execution of malicious code when opening specially crafted pages.<br \/>\n<br \/>Source: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=66459\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u043e\u0441\u0442\u043e\u044f\u043b\u0441\u044f \u0440\u0435\u043b\u0438\u0437 web-\u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0430 Firefox 158 \u0438 \u0441\u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u044b \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0448\u043b\u044b\u0445 \u0432\u0435\u0442\u043e\u043a \u0441 \u0434\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u043c \u0441\u0440\u043e\u043a\u043e\u043c \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 &#8212; 153.5.0 \u0438 115.43.0. \u0412 \u0440\u0430\u043c\u043a\u0430\u0445 \u043d\u043e\u0432\u043e\u0433\u043e \u0434\u0432\u0443\u0445\u043d\u0435\u0434\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u0446\u0438\u043a\u043b\u0430 \u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0440\u0435\u043b\u0438\u0437\u043e\u0432 \u043d\u0430 \u0441\u0442\u0430\u0434\u0438\u044e \u0431\u0435\u0442\u0430-\u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u0435\u0440\u0435\u0432\u0435\u0434\u0435\u043d\u0430 \u0432\u0435\u0442\u043a\u0430 Firefox 159, \u0440\u0435\u043b\u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043d\u0430\u043c\u0435\u0447\u0435\u043d \u043d\u0430 27 \u043e\u043a\u0442\u044f\u0431\u0440\u044f. \u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u043d\u043e\u0432\u0448\u0435\u0441\u0442\u0432\u0430 \u0432 Firefox 158 (1, 2, 3): \u0412\u043a\u043b\u044e\u0447\u0435\u043d\u0430 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u0434\u0435\u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0438\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0439 \u0432 \u0444\u043e\u0440\u043c\u0430\u0442\u0435 JPEG [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-183836","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0421\u043e\u0441\u0442\u043e\u044f\u043b\u0441\u044f \u0440\u0435\u043b\u0438\u0437 web-\u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0430 Firefox 158 \u0438 \u0441\u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u044b \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0448\u043b\u044b\u0445 \u0432\u0435\u0442\u043e\u043a \u0441 \u0434\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u043c \u0441\u0440\u043e\u043a\u043e\u043c \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 - 153.5.0 \u0438 115.43.0.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Alexander Kovalev\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/en\/blog\/news\/firefox-158-release\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47\u0420\u0435\u043b\u0438\u0437 Firefox 158 | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\u0421\u043e\u0441\u0442\u043e\u044f\u043b\u0441\u044f \u0440\u0435\u043b\u0438\u0437 web-\u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0430 Firefox 158 \u0438 \u0441\u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u044b \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0448\u043b\u044b\u0445 \u0432\u0435\u0442\u043e\u043a \u0441 \u0434\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u043c \u0441\u0440\u043e\u043a\u043e\u043c \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 - 153.5.0 \u0438 115.43.0.\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/en\/blog\/news\/firefox-158-release\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2026-10-13T14:54:16+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2026-10-13T14:54:21+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Firefox 158 Release | ProHoster","description":"The release of the Firefox 158 web browser has taken place, and updates for earlier long-term support branches\u2014153.5.0 and 115.43.0\u2014have been created.","canonical_url":"https:\/\/prohoster.info\/en\/blog\/news\/firefox-158-release","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"en_US","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0420\u0435\u043b\u0438\u0437 Firefox 158 | ProHoster","og:description":"\u0421\u043e\u0441\u0442\u043e\u044f\u043b\u0441\u044f \u0440\u0435\u043b\u0438\u0437 web-\u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0430 Firefox 158 \u0438 \u0441\u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u044b \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0448\u043b\u044b\u0445 \u0432\u0435\u0442\u043e\u043a \u0441 \u0434\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u043c \u0441\u0440\u043e\u043a\u043e\u043c \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 - 153.5.0 \u0438 115.43.0.","og:url":"https:\/\/prohoster.info\/en\/blog\/news\/firefox-158-release","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2026-10-13T14:54:16+00:00","article:modified_time":"2026-10-13T14:54:21+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/en\/wp-json\/wp\/v2\/posts\/183836","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/en\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/en\/wp-json\/wp\/v2\/comments?post=183836"}],"version-history":[{"count":1,"href":"https:\/\/prohoster.info\/en\/wp-json\/wp\/v2\/posts\/183836\/revisions"}],"predecessor-version":[{"id":183837,"href":"https:\/\/prohoster.info\/en\/wp-json\/wp\/v2\/posts\/183836\/revisions\/183837"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/en\/wp-json\/wp\/v2\/media?parent=183836"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/en\/wp-json\/wp\/v2\/categories?post=183836"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/en\/wp-json\/wp\/v2\/tags?post=183836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}