Can't like or dislike YouTube videos?

Hi there,

I can't seem to like or dislike videos on YouTube in Firefox. I've tried Internet Explorer and it works fine. It's not that the buttons aren't there (which a lot of people seem to have problems with from Googling), it's just when I click on them, they don't say that I've liked/disliked it and doesn't bring up the stats for the video like they normally do. Also, when I look at my 'likes' history, the video I've tried liking doesn't come up, which shows that the 'like' hasn't worked.

Here's a print screen or what it looks like:

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