Mozilla veröffentlicht Firefox 100 für Desktop mit neuen Features

Die Mozilla Foundation hat im Laufe des Tages die stabile Version 100 von Firefox für Windows, macOS und Linux veröffentlicht. Das Update enthält eine Reihe von Neuerungen, Korrekturen sowie Stabilitäts- und Leistungsverbesserungen und wird in den nächsten Tagen automatisch verteilt. Mit der neuen Version unterstützt Firefox jetzt die Anzeige von Bildunterschriften und Untertiteln bei YouTube-, Prime Video- und Netflix-Videos, die Sie in Picture-in-Picture ansehen. Aktivieren Sie einfach die Untertitel im seiteninternen Videoplayer, und sie werden in Bild-in-Bild angezeigt. Die Bild-in-Bild Funktion unterstützt jetzt auch Videountertitel auf Websites, die das WebVTT-Format verwenden. Des Weiteren erlaubt jetzt die Rechtschreibprüfung die gleichzeitige Verwendung mehrerer Sprachwörterbücher. Darüber hinaus wurden mit diesem Update auch diverse Sicherheitslücken in ältere Versionen von Firefox geschlossen. Details über die mit Firefox 100 geschlossenen Sicherheitslücken finden sich hier. Nutzer, die eine ältere Version von Firefox installiert haben, erhalten das Update automatisch. Das Update kann über Hilfe -> Über Firefox -> Update auf Version 100.0 durchführen auch manuell geladen werden. Weitere Informationen zu diesem Update finden sich weiter unten oder bei Mozilla.


Download -> Firefox 100.0 für Windows, macOS und Linux herunterladen

Die Version 100.0 von Firefox für Desktop kann ab sofort bei Mozilla heruntergeladen werden:

Die Version 100.0 von Firefox für Windows, macOS und Linux herunterladen:

Die Version 100.0 von Firefox enthält die folgenden Neuerungen und Verbesserungen:

Hello, we’re excited to release the 100th version of Firefox!

Thank you to everyone who got us here: To every employee past and present who played a role in delivering Firefox—thank you for your grit and hard work. To every contributor who championed open source, thank you for turning a browser into a movement! Finally, thanks to every user of Firefox—thank you most of all. We didn’t get here—17 years and 100 versions later—without your support. Your choice to use Firefox contributes directly to a better web, keeping it open and accessible to all. It is with a profound sense of gratitude and appreciation that we will continue fighting for this global public resource, putting people over profits. Want to collaborate with us? Join us over at Mozilla Connect, a collective space where you can share product feedback, submit ideas for new features, and participate in meaningful discussions that help shape future releases. Get involved, we want to hear from you!


  • We now support captions/subtitles display on YouTube, Prime Video, and Netflix videos you watch in Picture-in-Picture. Just turn on the subtitles on the in-page video player, and they will appear in PiP.
  • Picture-in-Picture now also supports video captions on websites that use WebVTT (Web Video Text Track) format, like, Canadian Broadcasting Corporation, and many more.
  • On the first run after install, Firefox detects when its language does not match the operating system language and offers the user a choice between the two languages.
  • Firefox spell checking now checks spelling in multiple languages. To enable additional languages, select them in the text field’s context menu.
  • HDR video is now supported in Firefox on Mac—starting with YouTube! Firefox users on macOS 11+ (with HDR-compatible screens) can enjoy higher-fidelity video content. No need to manually flip any preferences to turn HDR video support on—just make sure battery preferences are NOT set to “optimize video streaming while on battery”.
  • Hardware accelerated AV1 video decoding is enabled on Windows with supported GPUs (Intel Gen 11+, AMD RDNA 2 Excluding Navi 24, GeForce 30). Installing the AV1 Video Extension from the Microsoft Store may also be required.
  • Video overlay is enabled on Windows for Intel GPUs, reducing power usage during video playback.
  • Improved fairness between painting and handling other events. This noticeably improves the performance of the volume slider on Twitch.
  • Scrollbars on Linux and Windows 11 won’t take space by default. On Linux, users can change this in Settings. On Windows, Firefox follows the system setting (System Settings > Accessibility > Visual Effects > Always show scrollbars).
  • Firefox now supports credit card autofill and capture in the United Kingdom.
  • Firefox now ignores less restricted referrer policies—including unsafe-url, no-referrer-when-downgrade, and origin-when-cross-origin—for cross-site subresource/iframe requests to prevent privacy leaks from the referrer.


  • Users can now choose preferred color schemes for websites. Theme authors can now make better decisions about which color scheme Firefox uses for menus. Web content appearance can now be changed in Settings.
  • Beginning in this release, the Firefox installer for Windows is signed with a SHA-256 digest, rather than SHA-1. Update KB4474419 is required for successful installation on a computer running Microsoft Windows 7. For more details about this update, visit the Microsoft Technical Support website.
  • In macOS 11+ we now only rasterize the fonts once per window. This means that opening a new tab is fast, and switching tabs in the same window is also fast.
  • The performance of deeply-nested display: grid elements is greatly improved.
  • Support for profiling multiple java threads has been added.
  • Soft-reloading a web page will no longer cause revalidation for all resources.
  • Non-vsync tasks are given more time to run, which improves behavior on Google docs and Twitch.
  • Geckoview APIs have been added to control the start/stop time of capturing a profile.
  • Various security fixes.


  • Firefox has a new focus indicator for links which replaces the old dotted outline with a solid blue outline. This change unifies the focus indicators across form fields and links, which makes it easier to identify the focused link, especially for users with low vision.
  • New users can now set Firefox as the default PDF handler when setting Firefox as their default browser.
  • Some websites might not work correctly in Firefox version 100 due to Firefox’s new three-digit number. You can read about it in our blog post here! See the Mozilla Support article Difficulties opening or using a website in Firefox 100 for possible workarounds you can use. There, you will also find instructions for reporting a broken website so that Mozilla can help fix the problem.


Häufig gestellte Fragen nach einer Aktualisierung von Firefox

Die Entwickler der Mozilla-Foundation stellen Firefox für Windows, macOS und Linux in mehreren Sprachen zur Verfügung. Bitte beachtet, dass die Installation von Firefox eure existierende Firefox Version überschreibt. Weder eure Lesezeichen noch die Chronik gehen dabei verloren. Jedoch könnten einige Erweiterungen und andere Add-Ons nicht mehr funktionieren, bis entsprechende Aktualisierungen oder Updates zur Verfügung stehen.

via Mozilla