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How can I disable this from showing up whenever I open a pdf?

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This is considered to be a usability bug by many: bugzilla.mozilla.org/show_bug.cgi?id=767455. –  user151227 Jun 17 '13 at 10:47
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If you already have an alternate PDF viewer plugin for Firefox, you can completely disable the internal pdf.js viewer by going to about:config and setting pdfjs.disabled to true. –  Karan Jun 18 '13 at 0:44
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