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While most PDF files can be viewed directly in the browser some PDFs will trigger a "Save as"-dialog or will be downloaded automatically. This addon views all PDF files directly in the browser. You can still save the PDF by pressing CTRL+S (or CMD+S) after viewing them.

Please make sure that the setting under Firefox > Preferences > Applications > PDF is set to "Preview in Firefox" in order for this addon to work.

Some web servers are misconfigured and don't tell the browser that a file is a PDF. In this case the file will still be downloaded even when this addon is active. If you encounter a PDF that is downloaded feel free to send the URL to the support email address so I can check if this it's a bug in the addon or just a server issue.