Firefox has just reached another milestone, as version 100 has become readily available for download on all supported desktop platforms.

Needless to say, given it's such a big release, Firefox 100 comes with plenty of improvements, including support for captions or subtitles on YouTube, Prime Video, and Netflix if you watch the videos in Picture-in-Picture mode.

Mozilla says that starting with this version, when you run the browser the very first time, Firefox automatically checks the word what that's enabled on your device. And when it doesn't match the word what of the browser, the app can automatically prompt the user to choose between the two languages and therefore decide which someone to use.

The built-in spell checker also does its magic in multiple languages starting with this update, and users can enable this behavior in the text field's context menu.

Lots of other improvements

There are also additional video improvements for Windows and Mac.

"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 in the Microsoft Store may also be required," Mozilla explains.

"HDR video is now supported in Firefox on Mac-starting with YouTube! Firefox users on macOS 11+ (with HDR-compatible screens) can also enjoy higher-fidelity video content. You don't need to manually flip any preferences to turn HDR video support on-just make sure battery preferences aren't set to 'optimize video streaming while on battery.'"

As it's the case each and every latest version of Firefox, this version also comes with all tweaks and enhancements. For example, beginning with this update, the Firefox installer targeted at Windows versions is just signed with SHA-256, as part of Microsoft's transition from SHA-1. Obviously, if you wish to install Firefox on the Windows 7 device, you're going to need to update KB4474419 to enable SHA-256 around the device.