The release of the Firefox 100 web browser has taken place. Additionally, an update for the long-term support branch \u2014 91.9.0 has been established. The Firefox 101 branch is set to enter beta testing soon, with its release scheduled for May 31. <\/p>\n
Key innovations in Firefox 100: <\/p>\n
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The ability to use multiple dictionaries for different languages when checking spelling has been implemented. In the context menu, several languages can now be activated simultaneously.\n
In Linux and Windows, floating scrollbars are enabled by default, with the full scrollbar appearing only when the mouse cursor hovers over it. At other times, a thin indicator line shows the current page offset, but this indicator disappears after some time if the cursor is not moving. To disable the hidden scrollbars, the option 'System Settings > Accessibility > Visual Effects > Always show scrollbars' is provided.\n
In 'picture-in-picture' mode, subtitles are displayed when watching videos on YouTube, Prime Video, and Netflix, as well as on sites using the WebVTT format (Web Video Text Track), such as Coursera.org.\n
When launched for the first time after installation, a check is performed to see if the language of the Firefox build matches the operating system settings. If there are discrepancies, the user is prompted to choose which language to use in Firefox.\n
On the macOS platform, support for high dynamic range video is added on systems with screens that support HDR (High Dynamic Range).\n
On the Windows platform, hardware acceleration for AV1 video decoding is enabled by default on computers with Intel Gen 11+ and AMD RDNA 2 GPUs (except Navi 24 and GeForce 30) if the AV1 Video Extension is installed in the system. The overlay output mode (Video overlay) is also enabled by default for Intel GPUs in Windows, allowing for reduced energy consumption during video playback.\n
Users from the United Kingdom are provided with support for automatic filling and remembering of credit card numbers in web forms.\n
A more balanced distribution of resources during rendering and event processing has been ensured, which has resolved issues with delayed response times for the volume slider in Twitch.\n
For sub-resources and iframes loaded from other sites, the HTTP header Referrer-Policy settings 'no-referrer-when-downgrade', 'origin-when-cross-origin', and 'unsafe-url' are ignored, allowing the full URL to be returned in the 'Referer' header to third-party sites, bypassing default settings. It should be noted that in Firefox 87, with the aim of blocking potential leaks of confidential data, the policy 'strict-origin-when-cross-origin' was enabled by default, meaning paths and parameters are stripped from the 'Referer' when sending requests to other hosts over HTTPS, an empty 'Referer' is sent when transitioning from HTTPS to HTTP, and the full 'Referer' is provided for internal transitions within the same site.\n
A new focus indicator for links has been proposed (for example, it shows when cycling through links using the tab key) \u2014 instead of a dashed line, links are now framed by a solid blue line, similar to how active fields in web forms are highlighted. It is noted that using a solid line simplifies navigation for people with visual impairments.\n
Firefox has been made available as the default PDF viewer.\n
The WritableStreams API has been added, providing an additional level of abstraction for organizing streaming data writes into a channel with built-in flow control capabilities. The pipeTo() method has also been added to create unnamed channels (pipes) between ReadableStreams and WritableStreams. Interfaces WritableStreamDefaultWriter and WritableStreamDefaultController have also been introduced.\n
WebAssembly has implemented support for exceptions (WASM Exceptions), allowing the addition of exception handlers for C++ and applying stack unwinding semantics without the need for additional JavaScript handlers.\n
The performance of 'display: grid' elements with high levels of nesting has been improved.\n
CSS has added support for media queries 'dynamic-range' and 'video-dynamic-range' to determine the presence of a screen capable of HDR (High Dynamic Range).\n
Support for the non-standard HTTP header Large-Allocation has been discontinued. <\/ul>\n