Mozilla Firefox 99 is now available for download with GTK overlay scrollbars


Mozilla’s open-source, cross-platform Firefox 99 web browser is now available for download ahead of its official launch on April 5, 2022.

Firefox 99 comes with good news for Linux users as this release brings GTK overlay scrollbars for a more modern look. This means that scrollbars will now be thinner by default and taller to allow you to manually drag them with the mouse cursor when hovering over them.

They also disappear after one second if no movement is detected. However, GTK overlay scrollbars aren’t enabled by default yet, so you’ll need to access the Advanced Settings page by typing about:config in the address bar, by searching widget.gtk.overlay-scrollbars.enabled and set it to true by double clicking on it.

This release also strengthens the Linux sandbox by limiting access to the X Window System (X11) for processes exposed to web content. Users using Firefox Snap should be pleased with this new security feature.

Also for Linux systems, Firefox 99 adds initial Web MIDI API support, which requires a site-specific add-on to activate it on your webpage. “Initial” means that some limitations are present, such as the fact that device hot-plug detection is currently missing in this version, although it should work on most web pages.

Other than that, Firefox 99 appears to allow users to search for text with or without diacritics in the PDF viewer, as well as to toggle the “Narrate” feature in ReaderMode by pressing the “n” hotkey.

If you want to update your Firefox installation to version 99, you can download the binaries for 64-bit or 32-bit systems now from Mozilla’s FTP server. But, if you installed Firefox from your GNU/Linux distro’s software repositories, I recommend waiting for the new version to arrive there later this week.

Meanwhile, Mozilla is asking for community help in testing Firefox version 100, scheduled for May 3, 2022, for website compatibility with the three-digit version number.

You can do this by activating the new Firefox 100 User-Agent String option in the Experimental section of the Settings page accessed via about:preferences#experimental and report problems to

Last updated 6 hours ago


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