Hi. I like using Firefox, But when I open a PDF or download a document for PDF reading I continually encounter a problem which seriously interferes with reading the document with the PDF. The Problem is this - PDF Is unusable because of a box that appears on the right side of PDF. The box contains an animation of a highlighter continually highlighting a representation of text. How do I make this box go away and stay away so I can read the PDF? Thank you for any help you can provide to solve this issue. Sincerely W.