Firefox

But I did have issues with some Web SDRs on http://www.websdr.org/ when using Chromium-based browsers

And I wasn't the only one, looking at F.A.Q.:

Q: I'm using Chrome and don't hear audio (on some sites)!

A: Since version 71, Chrome does not allow every website to start playing audio, in order to stop annoying advertisements. Chrome tries to guess whether you want audio or not, but doesn't always get it right. On some WebSDR sites, you'll get an "audio start" button, on some you don't.

If you don't get audio, try the following:

• At the top right, click the 4 vertical dots, and then Settings.
• At the bottom, click Advanced.
• Under "Privacy and security," click Site settings.
• Select "Sound"
• Select "Add" and enter "http://*"

^(thanks^ ^to^ ^K9GL^ ^for^ ^these^ ^instructions)^

Note that the above effectively disables Chrome's "autoplay" policy for all http sites.

^Although^ ^stopping^ ^automatic^ ^sound^ ^from^ ^advertisements^ ^is^ ^a^ ^noble^ ^idea,^ ^I^ ^think^ ^Chrome's^ ^autoplay^ ^policy^ ^is^ ^fundamentally^ ^wrong.^ ^Instead^ ^of^ ^trying^ ^to^ ^guess^ ^what^ ^the^ ^user^ ^wants,^ ^the^ ^browser^ ^should^ ^simply^ ^ask^ ^the^ ^user^ ^whether^ ^he/she^ ^wants^ ^to^ ^allow^ ^the^ ^page^ ^to^ ^play^ ^sound^ ^(and^ ^remember^ ^that^ ^for^ ^later^ ^visits,^ ^of^ ^course).^