{"id":99543,"date":"2021-03-23T22:22:42","date_gmt":"2021-03-23T20:22:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-firefox-87"},"modified":"2021-03-23T22:22:42","modified_gmt":"2021-03-23T20:22:45","slug":"reliz-firefox-87","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/news\/reliz-firefox-87","title":{"rendered":"Release of Firefox 87","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"
The release of the web browser Firefox 87 has taken place. Additionally, an update for the long-term support branch 78.9.0 has been formed. The Firefox 88 branch has entered beta testing, with a release scheduled for April 20. <\/p>\n
Key innovations: <\/p>\n
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When using the search function and activating the Highlight All mode, markers now appear on the scroll bar to indicate the position of found keywords.
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Rarely used items have been removed from the Library menu. The Library menu now only contains links to bookmarks, history, and downloads (synchronized tabs, recent bookmarks, and the Pocket list have been removed). The screenshot below shows the state on the left as it was, and on the right \u2014 how it looks in Firefox 87:
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The Web Developer menu has been significantly simplified \u2014 individual links to tools (Inspector, Web Console, Debugger, Network Style Error, Performance, Storage Inspector, Accessibility, and Application) have been replaced with a single item, Web Developer Tools.
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The Help menu has been simplified, removing links to support pages, keyboard shortcuts, and the overview tour, which are now available on the general Get Help page. The button for importing from another browser has been removed.\n
A SmartBlock mechanism has been added, addressing issues on websites that arise due to the blocking of external scripts in private browsing mode or when enhanced tracking protection is activated (strict). SmartBlock also significantly improves the performance of some websites that may lag due to the inability to load tracking script code. It automatically replaces tracking scripts with placeholders that ensure the correct loading of the site. Placeholders have been prepared for some popular user tracking scripts listed in Disconnect, including scripts with widgets from Facebook, Twitter, Yandex, Vkontakte, and Google.\n
The Backspace key handler has been disabled by default outside the context of input forms. The removal of the handler is explained by the fact that the Backspace key is actively used while typing in forms, but outside focus on an input form, it is processed as a navigation to the previous page, which may lead to the loss of typed text due to unintentional movement to another page. An option browser.backspace_action has been added in about:config to restore the old behavior.\n
The formation of the HTTP Referer header has been changed. By default, the policy 'strict-origin-when-cross-origin' is set, which implies stripping paths and parameters when sending requests to other hosts over HTTPS, removing the Referer when switching from HTTPS to HTTP, and transmitting the full Referer for internal transitions within the same site. This change will apply to regular navigation requests (link clicks), automatic redirects, and when loading external resources (images, CSS, scripts). For example, when clicking a link to another site over HTTPS, instead of 'Referer: https:\/\/www.example.com\/path\/?arguments', it will now transmit 'Referer: https:\/\/www.example.com\/'.\n
For a small percentage of users, the Fission mode has been enabled, implementing an upgraded multi-process architecture for stricter page isolation. When Fission is activated, pages from different sites are always placed in the memory of different processes, each of which applies its own isolated sandbox. Additionally, the separation by processes is done not by tabs but by domains, which allows for further isolation of external scripts and iframe content. You can manually enable Fission mode on the page about:preferences#experimental or via the variable 'fission.autostart=true' in about:config. You can check if it's enabled on the about:support page.\n
The experimental implementation of the TCP Fast Open mechanism (TFO \u2014 TCP Fast Open, RFC 7413) has been removed. This mechanism allows for reducing the number of connection establishment steps by combining the first and second stages of the classic 3-step connection handshake into a single request, enabling data transmission at the initial stage of connection establishment. By default, the TCP Fast Open mode was disabled and required changing about:config to activate it (network.tcp.tcp_fastopen_enable).\n
As per the changes made to the specifications, the element is no longer included in checks using the pseudo-classes \u2018:link\u2019, \u2018:visited\u2019, and \u2018:any-link\u2019.\n
Non-standard values for the CSS property caption-side \u2014 left, right, top-outside, and bottom-outside have been removed (a configuration for returning is provided as layout.css.caption-side-non-standard.enabled).\n
By default, the \u2018beforeinput\u2019 event and the getTargetRanges() method are enabled, allowing web applications to override the behavior when editing text before the DOM tree is modified by the browser and gain greater control over input events. The \u2018beforeinput\u2019 event is sent to the handler of or another element with the \u2018contenteditable\u2019 attribute set before the element's value is changed. The getTargetRanges() method, provided by the inputEvent object, returns an array of values that indicate which part of the DOM will be modified if the input event is not canceled.\n
For web developers in page inspection mode, the ability to simulate media queries for \u2018prefers-color-scheme\u2019 has been implemented for testing dark and light themes without switching themes in the operating system. To enable dark and light theme simulation, buttons with sun and moon icons have been added to the top right corner of the web developer tools.\n
The inspection mode has been enhanced to activate the pseudo-class \u2018:target\u2019 for the selected element, similar to the previously supported pseudo-classes \u2018:hover\u2019, \u2018:active\u2019, \u2018:focus\u2019, \u2018:focus-within\u2019, \u2018:focus-visible\u2019, and \u2018:visited\u2019.
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In the CSS inspection mode, the handling of inactive CSS rules has been improved. Specifically, the \u2018table-layout\u2019 property is now inactive for non-table elements, while the \u2018scroll-padding-*\u2019 properties are marked as inactive for elements that do not support scrolling. The erroneous marking of the \u2018text-overflow\u2019 properties for certain values has been removed. <\/ul>\n
In addition to new features and bug fixes, Firefox 87 addresses 12 vulnerabilities, 7 of which are classified as dangerous. Six vulnerabilities (collected under CVE-2021-23988 and CVE-2021-23987) are caused by memory management issues, such as buffer overflows and access to freed memory areas. These issues could potentially allow an attacker to execute code upon opening specially crafted pages. <\/p>\n
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