Changelog:
New
* Firefox now supports the new AVIF image format, which is based on the
modern and royalty free AV1 video codec. It offers significant bandwidth
savings for sites compared to existing image formats. It also supports
transparency and other advanced features.
* Firefox PDF viewer now supports filling more forms (XFA-based forms, used
by multiple governments and banks). Learn more.
* When available system memory is critically low, Firefox on Windows will
automatically unload tabs based on their last access time, memory usage,
and other attributes. This should help reduce Firefox out-of-memory
crashes. Switching to an unloaded tab automatically reloads it.
* To prevent session loss for macOS users who are running Firefox from a
mounted .dmg file, they??ll now be prompted to finish installation. This
permission prompt only appears the first time these users run Firefox on
their computer.
* Firefox now blocks downloads that rely on insecure connections, protecting
against potentially malicious or unsafe downloads. Learn more and see where
to find downloads in Firefox.
* Improved web compatibility for privacy protections with SmartBlock 3.0.
Learn more
* Introducing a new referrer tracking protection in Strict Tracking
Protection and Private Browsing. Learn more
* Introducing Firefox Suggest, a faster way to navigate the web. Learn more
about the experience and locale-specific features.
Fixed
* The VoiceOver screen reader now correctly reports checkable items in
accessible tree controls as checked or unchecked.
* The Orca screen reader now works correctly with Firefox, no longer
requiring users to switch to another application after starting Firefox.
* Various security fixes
Changed
* TLS ciphersuites that use 3DES have been disabled. Such ciphersuites can
only be enabled when deprecated versions of TLS are also enabled. Learn
more.
* The download panel now follows the Firefox visual styles.
Enterprise
* Various bug fixes and new policies have been implemented in the latest
version of Firefox. See more details in the Firefox for Enterprise 93
Release Notes.
Developer
* Developer Information
Web Platform
* The UI for <input type="datetime-local"> has been implemented.
Security fixes:
#CVE-2021-38496: Use-after-free in MessageTask
#CVE-2021-38497: Validation message could have been overlaid on another origin
#CVE-2021-38498: Use-after-free of nsLanguageAtomService object
#CVE-2021-32810: Data race in crossbeam-deque
#CVE-2021-38500: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15, and
Firefox ESR 91.2
#CVE-2021-38501: Memory safety bugs fixed in Firefox 93 and Firefox ESR 91.2
#CVE-2021-38499: Memory safety bugs fixed in Firefox 93
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