How can I remove a huge blinking cursor shown on every website viewed with Firefox?

Ann Metz November 7, 2010
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For the past week or so there has been a huge cursor on every website I visit when using Firefox. Sometimes it blinks on the left and sometimes on the right. It takes up the entire length of the page. It’s a thin black line, just like the cursor in Word, except it’s in my browser.

Why is this happening and how can I stop it? Thanks for any answers.

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