Audio isn't blocked intentionally.

Is Firefox completely mute or is this problem limited to Live365?

Live365 appears to use Flash as its streaming player. Can you get sound out of Flash on other sites? I'm trying to think of who still uses Flash...

If Firefox is completely mute in all players (Flash, QuickTime, built-in audio player -- you can test here: http://hpr.dogphilosophy.net/test/), this can be caused by Firefox sending audio output to a no-longer-available device, such as a headset or television. I haven't experienced that myself, but other users have reported that after reconnecting the missing device, they then could switch the audio back to computer speakers. Not sure if that is relevant to your situation.

Thank you. Went to System Preferences, found Flash (although this is not in my Applications file), turned on audio to "allow". Coming thru very nicely. Hope I remember how to do this next time. Aloha

Hello,

I am glad to hear that your problem has been resolved. If you haven't already, please select the answer that solves the problem. This will help other users with similar problems find the solution more easily.

Thank you for contacting Mozilla Support.

You get a (possibly colored) Lego block icon on the left end of the location bar that indicates that the web page uses a plugin that Firefox is possibly blocking.

You can click this icon to see what it is about.

• https://support.mozilla.org/kb/why-do-i-have-click-activate-plugins
• https://support.mozilla.org/kb/add-ons-cause-issues-are-on-blocklist