My website doesn't open/start youtube video, after link clicked. In Firefox only.

On my Joomla project (running under xampp local host) has a link to a youtube video, which worked fine, but not anymore. After clicking it, the resized pop-up window (java script) doesn't open the video. Window remains black and status beam at the window botttom shows 'ready'.
This problem wasn't there in former Firefox releases (3.6.. now) and doesn't occur in ms-IE, Safari and other browsers.
Please let some one fix this.
Regards
Jac

Can you post a link to your website?
Do you see any errors in the Tools > Error Console about that problem?
* "Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
* "Remove the Cookies" from sites that cause problems: Tools > Options > Privacy > Cookies: "Show Cookies"
Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]

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