@Saoiray, you sent me down the right track!
My exclusive access settings to my headset sound were checked, so I tried unchecking them. Didn’t work.
BUT. I disabled all the alternative sound devices I had:
(Most of these are for piping specific application sounds back to recording software)
–And my browser sound works now! I guess the browser must’ve been attempting to send the sound elsewhere, even though my headset sound was set as Default. Weird. @GENJI Potential solution for you as well?
No idea why it suddenly happened. I’ve had these sound playback options for years at this point.