That is because you use an embed element to open an HTML file. opening an HTML file via embed is not working in Firefox. You need to use an object or iframe to embed a media player this way.

You can test this with a bookmarklet in the Web Console (Firefox/Tools > Web Developer).

javascript:(function(){var cE='iframe',eE=document.querySelectorAll('embed');for(i=0;E=eE[i];i++){N=document.createElement(cE);for(j in E.attributes){A=E.attributes[j];if((A.name!=undefined)&&(A.value!=undefined)){N.setAttribute(A.name,A.value)}}E.parentNode.replaceChild(N,E)}})()

See:

• [/questions/1029000] When I get a message 'A plugin is needed to display this content'

<iframe src="//www.youtube.com/embed/S6TVagigP8o?rel=0&amp;controls=0&amp;showinfo=0" frameborder="0" height="300" width="450"></iframe>

So if I post that link you gave me that starts with <iframe src= it should play properly? I loaded some plugin and now it seems to be playing on Firefox the way I had it coded previously...but not sure if it will work for everyone using Firefox.

Not sure why the above posted so weird. So if I post that link you gave me above then it should play ok? I loaded some plugin and it seems to work now the way I had it before, but not sure if it will work for everyone.

It went wrong in the above post because of the <iframe. You would have the escape the < as &lt; to avoid such issues.

As long as you use an OBJECT tag and not EMBED then it should always work OBJECT can play a direct media file (e.g. .mp4 link) or embed the media player in case you use an HTML YouTube link. To embed a YouTube link that is actually an HTML file then best is to use the above mentioned IFRAME to embed this media file.

I changed it to the code you gave me, but it's still not working. Can you check if you can view the video on my site (www.1stopnonprofitshop.com) on Firefox? I am able to view the video on Firefox on the computer I downloaded a plugin for...so I'm not sure if my plugins are just outdated. I just worry this will happen to others who try to view my website from Firefox.

It works for me on that test site.

• http://www.1stopnonprofitshop.com/

<iframe src="//www.youtube.com/embed/S6TVagigP8o?rel=0&controls=0&showinfo=0" frameborder="0" height="300" width="450"></iframe>

Did you check via the Lego block icon on the at the left end of the location bar that the Flash plugin is enabled?

• https://support.mozilla.org/kb/why-do-i-have-click-activate-plugins

You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• Hold down the Shift key and left-click the Reload button
• Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• Press "Command + Shift + R" (Mac)