After Firefox update 87 to 88 Amazon prime video services developed playback issues. Issue developed immediately after update. Issue is confined to Amazon only, other video streams (Youtube, Bitchute, etc., are not affected. Audio is intermittent static/distortion, along with video skipping. Audio playback is fine if playing while viewing a different tab displaying a static web page, after re-selecting Amazon tab issue is immediate. Issue is not present in other browsers such as Chrome. No changes were made in Firefox settings, or win 10. Router, Internet connection all OK. DRM enabled. OpenH264 ver. 1.8.1.1 - enabled and Widevine ver. 4.10.2209.1 - enabled Firefox was set to run in refresh, troubleshoot mode, clearing the startup cache - no difference. Please advise how to fix or rollback to version 87? Thank You Tom