They all work for me. I have them all installed plus Waterfox. see screenshot My audio works in all browsers. Being in Linux you should know by now. https://rumble.com/v29jnea-the-vaccinated-are-legal-property-of-the-patent-holder-says-spanish-doctor.html

Operating System: openSUSE Leap 15.6 KDE Plasma Version: 5.27.11 KDE Frameworks Version: 5.115.0 Qt Version: 5.15.12 Kernel Version: 6.4.0-150600.21-default (64-bit) Graphics Platform: X11 Processors: 16 × AMD Ryzen 7 PRO 6850HS with Radeon Graphics Memory: 62.1 GiB of RAM Graphics Processor: AMD Radeon Graphics Manufacturer: HP Product Name: HP EliteBook 865 16 inch G9 Notebook PC

What OS? What Desktop? X11 or Wayland? Run ffmpeg -version to see what versions you have installed.

Puppy Linux 8.0 works normally on google-chrome, microsoft edge and sidekick, but does not work on normal firefox, beta or nightly

What is your sound setup? I'm on laptops with a dock and the speakers are plugged into the dock. Show your sound from the systray like what you see in my screenshot. You need to check your packages for a pulseaudio / pipewire install. Let me get back in openSUSE and verify the package. I'll post a screenshot

Just searching your distro. https://forum.puppylinux.com/search.php?keywords=firefox+audio&sid=48fb277dd98698ba9b92a0d4dfbb5697

Found this. https://forum.puppylinux.com/viewtopic.php?p=123282&hilit=firefox+audio#p123282

Another find. https://stackoverflow.com/questions/70950310/linux-firefox-browser-audio-not-working-but-my-system-audio-works-properly

jonzn4SUSE nothing went right. I completely gave up on Firefox. I uninstalled them all. thanks for the help

Are you throwing in the towel?!?!?!  ;-)) It's just a package issue, pulseaudio and or pipewire. Reach out to your fellow pup users and just ask the same question you asked here and they will guide you. You can also run another OS (wink wink) from a live usb stick to test.

If you're done, just mark this as resolved and have a nice day.  ;-))