The security levels are now at 4 by default but at least the YT videos dont seem to mind. default / 4 (<~~was like that from the start, new FF default, didnt matter at all in the end)

Toggling that back to false gave me the sound.ī / modified / false (<~~ needed manual correction)ī.2 / modified / false (<~~was like that from the start) I believe what the update to FF58 did was resetting the entry back to 'true' by default. The autostart2 entry is on false by default with the current SB version. What did the trick is a manual override to the entry. In the end the security levels were fine on default. I went into the sandbox security levels and the settings and tried every combination. Thank you for providing the link, Barb! I've got to admit I feel a little dumb now seeing that there was a thread already discussing my problem. My guess is since FF58 is messing with volume controls and so forth that it now somehow requires access to resources that my Defaultbox currently cannot reach? What do you guys think does FF58 break Sandboxie audio? FF is as stated above version 58.0, 64-bit. Sandboxie version is 5.22, 64-bit (auto-update enabled).

The soundcard/loudspeakers work in general: videos in vlc work fine, so does music in winamp. Also FF is unmuted in the Windows Mixer and its volume slider is at 85%. FF58 introduced volume controls to each tab - I made sure that is not the problem at hand here (muted the tab and umuted it). Clearing the DefaultBox (I had Sandboxie create the sandboxed browser box for me when I first started using Sandboxie) and then restarting the sb.ed FF yielded the same issue. But then I checked a YT video in the unsandboxed FF58 and you guessed it I had sound. I was quick to blame Firefox itself because that's the only thing that has changed. No lowering of the resolution works in that case. In addition to that on Twitch all I see is the player practically showing a slideshow. After the installation went through I quickly realised that Youtube videos, Twitch content, pretty much any media with audio doesnt play sound in my sandboxed browser anymore.

That's all I do with Firefox outside the Sandbox in general. I just updated my Firefox to the new version 58.0 (in my unsandboxed firefox).

Download no sound with sandboxie 5.22