hello, first please try updating firefox and the flash plugin & see if this can already resolve the issue...

Update Firefox to the latest release

https://www.mozilla.org/plugincheck/

I can't update firefox until the compatibility issue with Norton Toolbar has been resolved. I updated my plugins, but that didn't solve the problem.

You can click the Volume icon on the Windows Taskbar near the clock and click the Mixer link at the bottom to open the mixer.
You can adjust the volume level for each application in that window, so make sure that Firefox is not muted or set at a low level.
Current Firefox versions use the plugin-container process to run plugins, so you need to check the volume setting for the plugin-container process.
You will only see the Firefox program or the Plugin Container in the Mixer if you are on a website that plays sound.

See:

• https://support.mozilla.org/kb/No+sound+in+Firefox
• https://support.mozilla.org/kb/Video+or+audio+does+not+play

You can clear the Flash local storage and settings if the Flash player is involved.

• Windows Control Panel > Flash Player > Storage: Local Storage Settings
  • Remove a specific domain: Local Storage Settings by site
  • Remove all domains: Delete All and Delete Data

Flash Website Storage Settings panel:

• http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager07.html

Global Storage Settings Panel:

• http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager03.html

When I start my photoshow in the PHOTOSHOW website the sound starts during the opening scene (TITLE PAGE). When the first picture comes on the sound STOPS.

I am using Firefox 20 and have updated all of the required plugins.

Internet Explorer has no problem showing the Photoshow pictures with sound.

I don't know what to do at this point.

Any help with be appreciated.