Provide steps to replicate your issue. I have no issue with the below link. see screenshot https://www.wsj.com/audio?mod=wsjheader Have you tried Firefox in Troubleshoot Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#w_how-to-start-firefox-in-4troubleshoot-modesf5safe-modesf

Thank you for your suggestions. Unfortunately still having issues...

Some WSJ sites do play audio, others do not. this is an example of a site that is not working for me.

  https://www.wsj.com/economy/central-banking/the-fed-is-tryingagainto-size-up-trump-77c8fc9b?mod=hp_lead_pos2

If I hover over "listen" the word is outlined in light grey. If I click on "listen" the word goes dark gray for about half a second, then returns to light grey.

If I go to the same page using Edge and click "listen" the word changes to "listening".

I tried both with and without the troubleshoot mode, but the effect is the same. I wish I could report an error message or something like that, but I can't see any error message so not sure where to start.

Any suggestions please?

I have no issues with the link you provided. see screenshot What security software are your running? Are you running pro or home version of Windows? If pro, you should have sandbox enabled for testing. https://www.howtogeek.com/399290/how-to-use-windows-10s-new-sandbox-to-safely-test-apps/ You can also boot into safe mode with networking and test.