Firefox failed to open PDF file but download it

This morning I checked my web based application (it generate PDF for reporting purpose) located at my client’s office. They said that PDF report no longer viewable by browser but open download dialog instead. I got information that they just reinstall some application because of virus attacks.

I checked the browser (Firefox) configuration, nothing seems wrong.  I checked Adobe Acrobat and nothing’s seem wrong either. Then I found a simple trick to solve the problem, thanks to Google.

Go to C:Program FilesAdobeAcrobatReaderBrowser and you will see a file with .DLL extention. Copy the DLL file into Firefox’s plugin folder, it’s something like C:Program FilesMozilla FirefoxPlugins. Then restart Firefox and try to open a PDF file or drag and drop a PDF file into Firefox.

Problem’s solved.