Firefox 100, was officially released today, bringing a host of new features and improvements, including multilingual spell checking, HDR video on Mac, and hardware-accelerated AV1 video decoding on Windows.
The major updates for Firefox 100 are as follows:
Spell Checker: The spell checker in Firefox can now use multiple dictionaries at the same time.
AV1 Codec: Hardware acceleration of the AV1 codec is enabled on Windows for supported graphics cards (Intel Gen 11+, AMD RDNA 2, GeForce 30).
Scrollbars: Scrollbars no longer take up any space and are hidden on Windows 11 and Linux, or users can manually make them visible.
SHA-256: The Firefox installer is signed with SHA-256 and no longer uses the legacy SHA-1. Windows 7 users will need to install the KB4474419 update for this to work.
HDR video: Firefox for Mac will support HDR video playback, requiring a Mac with an HDR-compatible monitor and macOS 11 or later.
Picture-in-picture mode: Displays subtitles and titles when using picture-in-picture mode, and supports WebVTT-formatted websites such as YouTube, Netflix, and Prime Video.
Find the update download on the About page of Firefox browser, or manually download Firefox 100 directly from the FTP download page.