Just a heads up to soundposters, I figured out why pomf soundposts weren't playing for me for the last few months.
If you CAN still access pomf files directly, but their sounds won't play via soundplayer, you need to go into your Ublock Origin My Filters, not Trusted Sites, but My Filters, and add
>@@||a.pomf.cat^as a line
If you want to be safe, you can also add these to Trusted Sites, but they didn't help me until I tried the above on the advice of an /a/non
>@@||pomf.cat/*$media,domain=4channel.org>a.pomf.cat