Mozilla officially released the stable version of Firefox 99 today, and users can already receive new version updates through the browser's update function. In addition to regular bug fixes and security updates, the new version also brings some new features. The specific updates are as follows:
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You can now switch between narration and reading in reading mode via the keyboard shortcut "n";
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Linux: GTK overlay scrollbars are now enabled (meaning the scrollbars now look thinner by default and are easier to drag when the mouse is over them; if no mouse movement is detected, the scrollbars also Reverts back after a second; not enabled by default in stable releases)
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Added support for searching with or without appended symbols in the PDF viewer
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The Linux sandbox has been enhanced: processes affected by network content can no longer access the X Window System (X11)
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Firefox now supports the Web MIDI API on Windows, macOS, and Linux. The current implementation has some limitations like lack of hotplug detection, but should work with most existing websites. To enable the API on your website, an additional add-on is required.
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Firefox now supports credit card autofill in Germany and France
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Various security fixes
With the official release of Firefox 99, the beta version is also updated to Firefox 100, and the Nightly version is updated to Firefox 101.
More details can be found here: https://www.mozilla.org/en-US/firefox/99.0/releasenotes/