How to enable built-in PDF Reader in Firefox 15

To enable built-in PDF Reader in Firefox 15 or above

1.Open firefox web browser.
2.Type about:config and hit Enter in the address bar.
3.And click I’ll be careful, I promise! button.
4.In the search bar type pdfjs.disabled and then right click this option.
5.In the context menu choose Toggle to change the setting from True to False or double-click the entry.

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