How to unlock no matter what URL containing a phrase that I've accidentally blocked?

I was recently on the Internet site the Blackboard of the University where I was trying to see a series of videos embedded in the site. Most of the time they would work not and recommended Firefox I had to install a plug-in, but sometimes the videos would work. In a case where the video was not working, I clicked on the tab "to block" which appear as I flew over the mouse to play the video. Open a pop-up setting and I started clicking around to try to let the media (flash or java or something, I don't remember) to play the video. I clicked on an area which has been marked something like www.myuniversity.blackboard.edu^. After that, I can access is no longer a URL containing the above text. I search everywhere to find a way to undo this action, and I can't find the same window parameter pop up anywhere. Help, please.

Furthermore, when you are on the page, you can also click on plugin notification icon in the address bar (looks like a small block of Lego) to see if Firefox give permission to site to use one or more plugins.

Tags: Firefox

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