I came across an issue in firefox relating to adobe Flash. I'm also adressing the issue with adobe as it might be related to action script in the SWF. However if that were the case I don't quite understand why it's limited to Firefox. The problem is as follows. Using a simple mp3 player to play news highlights i came across an issue where that if other tabs or windows were open where flash audio played (like a youtube video) the audio in all these tabs/windows would cease as soon as the simple mp3 player was loaded or the stop button was pressed. This proved to be a problem among many of our customers who listen to online radio via our players (in a popup window/tab/seperate window) and browse on our site where this mp3 player is loaded. I provided a test environment where you can find the player. http://www.classicfm.nl/audiotest/ Test by having flash audio playing and open the above link in another tab or window. As the player loads it stops all audio. Kind regards Dwayne