Firefox 91 Released As New ESR Base, HTTPS First Policy For Private Mode

Written by Michael Larabel in Mozilla on 10 August 2021 at 09:00 AM EDT. 41 Comments
Firefox 91.0 is out this morning as the latest monthly update to Mozilla's cross-platform web browser.

Firefox 91 is the newest "Extended Support Release" (ESR) meaning that it's maintained longer than the normal release cycle and thus a popular target for enterprises and other organizations. Firefox 78 is the current ESR release to this point, thus many changes between then and now for those that stick only to such releases.

Firefox 91 also now attempts HTTPS connections by default rather than HTTP when running in the private browsing mode, the simplified printing mode in Firefox has been restored, various small performance improvements, improved cookie clearing for site-wide data, Firefox on Linux now supports enterprise policies with Snap, and a variety of different developer API additions.

The newest Firefox release as usual can be downloaded from

Firefox 92 in September meanwhile we are already quite looking forward to in hopefully having AVIF image support on by default.
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Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

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