
On Linux, Firefox now requires PulseAudio to play sound and no longer plays sound directly with ALSA. When not using Direct2D on Windows, Skia is used for content rendering

Migrated Firefox users on Windows XP and Windows Vista operating systems to the extended support release (ESR) version of Firefox. (Note: Firefox continues to permit SHA-1 certificates that chain to manually imported root certificates.) Read more about the Mozilla Security Team’s plans to deprecate SHA-1

Silverlight, Java, Acrobat and the like are no longer supported. Removed support for Netscape Plugin API (NPAPI) plugins other than Flash. Any version of Mozilla Firefox distributed on Uptodown is completely virus-free and free to download at no cost.
