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When I try to download a pdf file it turns into a .do file and can't be opened by my Samsung note 3

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When I try to download a pdf file it turns into a .do file and can't be opened by my Samsung note 3. Once downloaded the file can't be found in any part of the device memory and can't be opened by the browser mozilla.

When I try to download a pdf file it turns into a .do file and can't be opened by my Samsung note 3. Once downloaded the file can't be found in any part of the device memory and can't be opened by the browser mozilla.

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Hello there,

Have you checked if your PDF Plugins are updated? https://www.mozilla.org/en-US/plugincheck/

For more options: https://support.mozilla.org/en-US/kb/view-pdf-files-firefox-without-downloading-them

Hope this helps!