Mozilla Firefox 121.0.1

Une nouvelle mouture du navigateur Firefox est arrivée. Pour cette version 121, des nouveautés assez intéressantes sont à noter pour tous les systèmes d'exploitation.

Du côté de Windows, le support matériel du décodage de l'AV1 passera par l'installation de l'extension adéquate disponible sur le store de Microsoft. Firefox demandera de l'installer dès la première vidéo rencontrée.
Sur macOS, Firefox pourra utiliser les commandes vocales du système pour effectuer les tâches courantes.
Sur Linux, le passage du compositeur vers Wayland apporte la gestion de nouvelles fonctions de gestion de navigation, comme le support du pavé tactile et des ses gestes. Mais ce n'est pas tout, car la partie accélération matérielle sera aussi améliorée.

A part ceci, Firefox peut forcer le soulignement des liens hypertexte peu importe le style appliqué par la feuille de style d'un site internet.

D'autres nouveautés d'ordre techniques sont également disponible pour les développeurs…

Voici la liste complète des modifications par rapport à la version précédente :

Nouveautés de Firefox 121.0.1 (09/01/2024)


  • Fixed unexpected line wrapping in some CJK contexts caused by changes in ideographic space handling. (Bug 1870973)
  • Fixed a hang when loading sites containing column-based layouts under some circumstances. (Bug 1867784)
  • Fixed missing rounded corners for videos playing over another video. (Bug 1869994)
  • Fixed Firefox not closing properly and other applications being unable to use a USB security key after being previously used during a Firefox session. (Bug 1863135)

Consulter les notes de version de Mozilla Firefox 121.0.1

Nouveautés de Firefox 121.0 (19/12/2023)


  • Firefox now prompts Windows users to install the Microsoft AV1 Video Extension to enable hardware decoding support for the AV1 video codec from about:support if not already installed.
  • Firefox now supports Voice Control commands on macOS systems.
  • On Linux, Firefox now defaults to the Wayland compositor when available instead of XWayland. This brings support for touchpad & touchscreen gestures, swipe-to-nav, per-monitor DPI settings, better graphics performance, and more.Note that due to Wayland protocol limitations, Picture-in-Picture windows require an extra user interaction (generally right-click on the window) or a shell / desktop-environment tweak. See bug 1621261 for related discussion and tracking, this post for a KDE configuration, and this extension for GNOME.
  • Firefox can now force links to always be underlined. This option can be enabled in the Browsing section of the Firefox Settings menu.Screenshot of new Always underline links option
  • The PDF viewer now includes a floating button to simplify deleting drawings, text, and images added in PDFs.Screenshot of new floating delete button




  • Developer Information
  • The Firefox Debugger now includes a new feature: an option to disable the debugger; keyword on the current page. This feature is accessible via a new checkbox in the Breakpoints side panel labeled Pause on debugger statement, located next to the existing Pause on exceptions checkbox. By default, this option is enabled, meaning that the debugger statements are active unless manually disabled.
    Screenshot showing new Pause on debugger statement option
  • As part of our work on improving the accessibility of Firefox Developer Tools, we've unified the focus indicator across the toolbox. The focus indicator is now larger with improved contrast, featuring a white box-shadow for enhanced visibility on blue backgrounds. Adjustments have also been made to ensure clear visibility across shared components and frequently used panels, preventing overlap with element borders or backgrounds.

Web Platform

  • The :has() selector is now supported. This allows authors to match an element that has, or "anchors", at least one element matching its relative selector.
  • The hanging and each-line keywords are now supported for the text-indent CSS property, offering more convenient paragraph layout options for styles such as bibliographies, poetry, etc.
  • The balance keyword is now supported for the text-wrap CSS property, which can improve the appearance of short multi-line text blocks such as long headings or captions by harmonizing the line lengths.
  • Lazy loading iframes are now supported (<iframe loading=lazy>). Lazy loading iframes are only loaded when visible, so non-critical iframes can load later when needed to speed up initial page loads, reduce initial network usage, etc.
  • Support has been added for tail call elimination in WebAssembly language to improve support for functional languages.

Consulter les notes de version de Mozilla Firefox 121.0

Mozilla Firefox
Version : 121.0.1
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