I have a flashing line at the bottom of my laptop even when im not online.Can you tell me what it is and how to fix it?

the line is pulsing and it just started today,could it be caused by the updates i installed yesterday?

Doesn't sound like anything I have seen from Firefox on my Linux netbook, but I still using Firefox 3.6.18 there. Can you give us a screenshot of what you are talking about?
https://support.mozilla.com/en-US/kb/Adding+screenshots

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