• Windows: Resolved an issue causing some screen readers to not interact correctly with Firefox anymore (bug 1714212)

• Updated translations, including full Spanish (Mexico) localization and other improvements (bug 1714946)

• Fix various font related regressions (bug 1694174)

• Linux: Fix performance and stability regressions with WebRender (bug 1715895, bug 1715902)

• macOS: Fix screen flickering when scrolling a page on an external monitor (bug 1715452)

• Enterprise: Fix for the DisableDeveloperTools policy not having effect anymore (bug 1715777)

• Linux: Fix broken scrollbars on some GTK themes (bug 1714103)

• Various stability and security fixes.  https://www.mozilla.org/en-US/security/advisories/mfsa2021-27/

==================================

Available via the internal updater:   Help / About Firefox