{"id":125641,"date":"2025-05-27T21:05:06","date_gmt":"2025-05-27T19:05:08","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-firefox-139"},"modified":"2025-05-27T21:05:06","modified_gmt":"2025-05-27T19:05:08","slug":"reliz-firefox-139","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/news\/reliz-firefox-139","title":{"rendered":"Release of Firefox 139","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>The release of web browser Firefox 139 has taken place, and updates for the previous long-term support branches 115.24.0 and 128.11.0 have been formed. The Firefox 140 branch has entered beta testing, with a release scheduled for June 24.     <\/p>\n<p>Key features in Firefox 139:  <\/p>\n<ul>\n<li class=\"l\"> The ability to set a custom background image or choose a background color for the page shown when opening a new tab has been added. This feature is not enabled by default for all users and will gradually be activated for an increasing percentage of them. For forced activation, the 'Firefox Labs' settings section can be used (about:settings#experimental). The new release also includes new standard background images and introduces a new category of wallpapers called 'Celestial'.    <center><img decoding=\"async\" alt=\"Release of Firefox 139\" src=\"\/wp-content\/uploads\/2025\/05\/cee4b4f1d52fe4e5da0c823d3f347386.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>\n<li class=\"l\"> Experimental support for link previews on the page has been added \u2014 when holding Alt+Shift and hovering over a link, a popup will appear with information about the page the link points to. The information includes the title, an image, and a brief report about the content, generated by a large language model (the built-in AI assistant running on the user's system). This feature can be enabled through the 'Firefox Labs' section (about:settings#experimental).           <center><img decoding=\"async\" alt=\"Release of Firefox 139\" src=\"\/wp-content\/uploads\/2025\/05\/d8e96f12d940416302a3fbfc0b7ea868.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>\n<li class=\"l\"> The translation feature from one language to another now works not only on web pages but also on internal pages of extensions accessible via the URL 'moz-extension:\/\/'.\n<li class=\"l\"> Data loading performance has been significantly enhanced when using HTTP\/3, particularly noticeable when resuming connections (QUIC 0-RTT) and over communication channels with high throughput and long latency.\n<li class=\"l\"> In line with Chrome's move to encrypt users' sensitive data on the Windows platform, support for direct migration of passwords and payment methods from Chrome has been discontinued. To transfer passwords from Chrome now, users must manually export passwords in CSV format and upload the resulting file to Firefox.\n<li class=\"l\"> On June 10, the Review Checker (Fakespot) service will cease operations, and on July 8, the Pocket service will do the same.\n<li class=\"l\"> The Temporal object is enabled by default, offering an alternative set of methods for working with dates and times. The new API allows for date manipulation with and without time zones, converting time, formatting output, and performing arithmetic operations with time. Time can be represented in a time zone-independent manner (Temporal.PlainDate, Temporal.PlainTime, Temporal.PlainDateTime), with time zone binding (Temporal.ZonedDateTime), and in epoch representation (Temporal.Instant \u2014 the number of nanoseconds since January 1, 1970).\n<li class=\"l\"> The ability to truncate timer precision for Workers has been added.\n<li class=\"l\"> Page search operations now encompass the content of HTML blocks '<details>'. If the sought phrase is present within the block, it will automatically expand during the search.\n<li class=\"l\"> A new flag 'until-found' has been proposed for the 'hidden' attribute, making the element searchable on the page and scrollable through a text mask. For example, hidden text can be added to the page, the content of which will be found during local search.\n<li class=\"l\"> The method window.getSelection().toString() ensures correct serialization of text selected in text fields.\n<li class=\"l\"> For WebAuthn, largeBlob and credProps extensions have been implemented for storing and retrieving additional data related to the user account.\n<li class=\"l\"> The HTMLDialogElement API has been updated with the method requestClose(), which initiates the closing of a dialog based on the <dialog> HTML element. Unlike the Close() method, the new method allows for cancellation of the closing by adding a 'cancel' event handler.\n<li class=\"l\"> The behavior of the built-in editor for contenteditable and designMode is similar to Chrome in terms of handling whitespace before the block boundary and between visible content (Firefox no longer adds an element &lt;br&gt; after the whitespace before the block boundary).\n<li class=\"l\"> In the web developer tools, filter settings are now preserved in the network inspection panel between different sessions. In the JavaScript debugger, the format for the line where execution is paused has been improved, and the root directory is limited to the selection. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/en\/domain\/\"   title=\"are set up correctly.\" data-wpil-keyword-link=\"linked\">are set up correctly.<\/a>.\n<li class=\"l\"> The Android platform version has implemented support for bookmark sorting, improved the download management interface, enhanced news feed capabilities, and begun implementing support for the JetPack Compose framework.              <\/ul>\n<p>In addition to new features and bug fixes, Firefox 139 addresses 14 vulnerabilities. Eight of these vulnerabilities stem from memory handling issues, such as buffer overflows and accessing freed memory regions. These issues could potentially allow an attacker to execute code through specially crafted pages. One vulnerability (CVE-2025-5262) has been assigned a critical severity level. It is caused by a double-free error in the libvpx encoder code, which supports VP8 and VP9 formats, and can be exploited via WebRTC.    <\/p>\n<p>In the beta version of Firefox 140, the context menu displayed when right-clicking on a tab has a new option 'Unload Tab', allowing the tab to be unloaded from memory to reduce resource consumption. The vertical tab panel now allows resizing of the pinned tabs area. Users can also add their own search engines (Settings &gt; Search &gt; Add).<br \/>\n<br \/>Source: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=63313\">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 139 \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; 115.24.0 \u0438 128.11.0. \u041d\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 140, \u0440\u0435\u043b\u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043d\u0430\u043c\u0435\u0447\u0435\u043d \u043d\u0430 24 \u0438\u044e\u043d\u044f. \u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u043d\u043e\u0432\u0448\u0435\u0441\u0442\u0432\u0430 \u0432 Firefox 139: \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u0441\u043e\u0431\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0433\u043e \u0444\u043e\u043d\u043e\u0432\u043e\u0433\u043e \u0438\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u044f \u0438\u043b\u0438 \u0432\u044b\u0431\u043e\u0440\u0430 \u0446\u0432\u0435\u0442\u0430 \u0444\u043e\u043d\u0430 \u0434\u043b\u044f \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u044b, \u043f\u043e\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u043c\u043e\u0439 \u043f\u0440\u0438 \u043e\u0442\u043a\u0440\u044b\u0442\u0438\u0438 \u043d\u043e\u0432\u043e\u0439 \u0432\u043a\u043b\u0430\u0434\u043a\u0438. \u0424\u0443\u043d\u043a\u0446\u0438\u044f \u043f\u043e\u043a\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":125642,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-125641","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - 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