Firefox 100 arrives with a new GTK scrollbar and PiP improvements, among others

Today is a day of celebration at Mozilla. The company launched Firefox 100, a round figure that has been reached before thanks to its four-week update cycle. It introduces novelties, but one of the most interesting for Linux users is that it introduces a new special scroll bar with a design based on GTK.

Among the rest of the novelties, it should also be mentioned that its floating video window, also known as PiP for its acronym in English (Picture-in-Picture), added support for subtitles. In the following list, longer than usual, you have this and the rest of the new features that have arrived together with Firefox 100.

What's new in Firefox 100

• Now we can see the subtitles in the YouTube, Prime Video and Netflix videos that we see in Picture-in-Picture. We just have to activate the subtitles in the video player of the page and they will appear in PiP. Video captions on websites that use the WebVTT (Web Video Text Track) format, such as Coursera.org, Canadian Broadcasting Corporation, and many more.
• On the first run after installation, Firefox detects when the language does not match the language of the operating system and offers the user the possibility to choose between the two languages.
• Firefox's spell checker now checks spelling in multiple languages.
• HDR video is now supported in Firefox on Mac, starting with YouTube. Firefox users on macOS 11+ (with HDR-capable displays) can enjoy higher fidelity video content.
• Hardware accelerated AV1 video decoding is enabled on Windows with supported GPUs (Intel Gen 11+, AMD RDNA 2 Excluding Navi 24, GeForce 30). Installation of the AV1 Video Extension from the Microsoft Store may also be required.
• Video overlay is enabled in Windows for Intel GPUs, which reduces power usage during video playback.
• Improved fairness between painting and handling other events. This greatly improves the performance of the volume slider on Twitch.
• Scroll bars in Linux and Windows 11 do not take up space by default. On Linux, users can change this in Settings. Firefox now supports credit card autofill and UK capturing.
• Firefox now ignores less restrictive 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 the color scheme that Firefox uses for menus. The appearance of web content can now be changed in Settings.
• On macOS 11+ fonts are now only rasterized once per window. This means that opening a new tab is fast, and switching between tabs in the same window is also fast.
• The performance of deeply nested grid elements has been greatly improved.
• Added support for profiling multiple Java threads.
• Soft reloading a web page will no longer cause all resources to be revalidated.
• Non-vsync tasks have 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.
• Firefox has a new focus indicator for links that replaces the old dotted outline with a solid blue outline. This change unifies focus indicators on form fields and links, making it easier to identify the link in focus, especially for users with low vision.
• New users can now set Firefox as the default PDF manager by setting Firefox as their default browser.
• Some websites may not work properly in Firefox version 100 due to the new three-digit Firefox number.

Firefox 100 can now be downloaded since official website. For users of Ubuntu 21.10 onwards, remember that the update is coming very soon and will be applied in the background, as it is only available as a snap package. for those who want Other options, you can also install the binaries or use the Mozilla repository.