For the URL http://www.nationalmssociety.org/Resources-Support/Library-Education-Programs/Ev eryday-Matters, safari does not play the associated sound; firefox does play the sound.
iMac, OS X Mountain Lion (10.8.5)
1. Empty Caches
Safari > Preference > Advanced
Checkmark the box for "Show Develop menu in menu bar".
Develop menu will appear in the Safari menu bar.
Click Develop and select "Empty Caches" from the dropdown.
2. Delete Cookies
Safari > Preferences > Privacy > Cookies and other website data:
Click the “Details” button.
Remove all cookies except ones from Apple, your internet service provider and banks.
3. Disable Extensions and test.
Safari > Preference > Advanced
Checkmark the box beside "Show Develop menu in menu bar".
Develop menu will appear in the Safari menu bar.
Click Develop and select “Disable Extensions” from the dropdown.
Thanks for the response. On further digging, it appears that safari is unable to play youtube videos.
Try Playing a YouTube video.
Allow Plug-ins
Safari > Preferences > Security
Internet Plug-ins > "Allow plug-ins"
Enable it.
Click " Plug-in Settings" button.
In the sheet that drops down, highlight Adobe Flash Player, if not already.
Make sure that "Allow" is selected for "Currently open website" and “When visiting other websites".
Click Done.
no sound is played in safari; sound is played in firefox
