Embedded videos in many websites won't open.

I have found that the embedded videos on many but not all websites won't open now when I'm browsing in Firefox. I am running 27.0.1. I have Adobe Flash Player installed so that's not an issue. As some examples of non-openers: Embedded videos in some of the news articles on Yahoo!'s home page; videos on the davidlynchfoundation.org site. I tried disabling the "Adblock Edge" add-on, but it didn't change anything. In many cases, their is a big empty space in the text where the video should be, i.e. there isn't any indication that there's a video there. In other cases, I click on the visible start icon, but the screen of the vid just goes to black.
When I switched to Safari, all of these embedded videos opened without a hitch. I'd rather continue with Firefox, but will have to switch to Safari if we can come up with a "fix" for this problem.
I have a MacBook running Snow Leopard. This is a new problem which I haven't experienced with Firefox previously.
BTW: I have only minimal tech skills.
Thanks for any advice/help you can provide.
Dave

Hi Yogidave,
It sounds like the videos are not loading properly. If there are not video controls, but there is a space for the video, this means that the item is loading, but the player is not loading.
In understanding what you tried:
I tried disabling the "Adblock Edge" add-on - it looks like this is no longer in the list of add ons that you have in the troubleshooting information, when you took this out, do the videos still leave space in the page where the video should be?
The examples you used: Yahoo homepage and the davidlynchfoundation: I know the latter uses an embedded youtube video with has its own video player that uses flash, as well at Yahoo. (I am not sure if all the videos are flash in Yahoo)
Since this is the case, can you please check your extensions to see if you have Flash installed or if you have it disabled? If so, please turn it on and visit the sites that are giving you issues to see if this resolves the problem.
This article has pretty simple instructions how to install the player if it is not there[[Install the Flash plugin to view videos, animations and games]]
The only other test I can suggest is to see if another type of embedded video does the same thing. For example, if you have netflix or hulu, see if those video players do the same thing.
I hope this helps. (also I tested those pages in beta and it loads just fine, you are not short of watching videos again in firefox)

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