The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

1. Go to Firefox > Help > Troubleshooting Information.
2. Click the "Reset Firefox" button.
3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
4. Firefox will open with all factory defaults applied.

Further information can be found in the Refresh Firefox - reset add-ons and settings article.

Did this fix your problems? Please report back to us!

I'm afraid it didn't... I tried it first thing after I reset Firefox and it didn't do anything. Thanks for the help though :)

Also, I think it might be worth mentioning that embedded youtube videos work on other browsers, so i'm guessing I installed an extension or something of the sort that disabled it on firefox...

I'm having a similiar issue. We've narrowed it down to Firefox 18 (though we've seen it sporadically on versions 16, 17) and only on Windows (on Vista, 7 & 8 - not sure about XP).

The issue is that some embedded YouTube clips will not load. When the page loads, all you see is a black box.

In some instances, reloading the page will finally get the video to load.

Here's a URL that seems to demonstrate the issue:

http://extramustard.si.com/2013/01/31/beyonce-sings-natioanl-anthem-at-super-bowl-press-conference/

Also, I tested the following builds and here's the status of whether the exhibit the behavior or not:

Firefox 16.01: Works fine. Firefox 16.02 Works fine. Firefox 17: Does not play Firefox 18: Does not play. Firefox 19: Does not play. Latest nightly build: Does not play.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

• Do NOT click the Reset button on the Safe mode start window or otherwise make changes.

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Also check that you aren't blocking cookies.

• https://support.mozilla.org/kb/Cookies
• http://kb.mozillazine.org/Cookies

Clear the cache and the cookies from sites that cause problems.

"Clear the Cache":

• Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Tools > Options > Privacy > Cookies: "Show Cookies"

Note that a reset imports cookies, so isn't really suited if cookie issues are a possible cause, unless you clear the cookies.

This issue may arise if you are trying to use the object or embed elements to play the video. The best way to do this cross-browser, and the current recommendation by Google, is to use an iframe.

An example for embedding playlists:

<iframe src='http://www.youtube.com/embed/videoseries?list=PLFE11CE11D5EA7D87' allowfullscreen frameborder='0'></iframe>

An example for embedding a single video:

<iframe src='http://www.youtube.com/embed/C6WKYAZXlCA?modestbranding=1&rel=0' allowfullscreen frameborder='0' ></iframe>

well, what solved it eventually was clearing cookies somehow I skipped that step during the time I spent figuring it out Thanks anyway everybody!