Plex: Reduces the auto play time to 5 seconds. Tested in the web view.
Apply the patch file to:
/usr/lib/plexmediaserver/Resources/Plug-ins-77cb9455c/WebClient.bundle/Contents/Resources/js
chunk-2-7f5e9044ba52846083b1-plex-4.22.2-2a5c45e.js
May be called slightly different if the plex version changes/depending on your profile.
If in doubt, grep for secondsLeft.
Credit: kdizzley