Add-ons that violate Mozilla's Add-on Policies or jeopardize user safety and privacy may be blocked from running in Firefox.
Some videos from streaming services don't play in Firefox and Firefox ESR. This is fixed in Firefox version 88.0.1 and Firefox ESR 78.10.1
If you are experiencing difficulty downloading or viewing images in Firefox, follow the troubleshooting instructions in this article.
This article will help you solve audio and video problems on web pages.
Learn what steps to take if you can't hear sound in Firefox.
If Firefox has trouble playing video or music on a Windows computer, you can install the Media Feature Pack, if it's missing. Learn more.