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when launching firefox a pdf opens

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I have a user that is running Firefox 3.6.28 when she launches Firefox a PDF opens with it. It is not a tab.

I have a user that is running Firefox 3.6.28 when she launches Firefox a PDF opens with it. It is not a tab.

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First you need to update to Firefox 16.0.2, Firefox 3.6 is no longer supported, and not only is vulnerable to a long list of publicly known security issues, has many hundreds of known bugs and issues. Update Firefox to the latest release.

After updating Firefox, try to Reset Firefox if the issue still exists. Refresh Firefox - reset add-ons and settings

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If it is not a tab then what does she get (maybe attach a screenshot)?

Is this an unfinished download?

In that case try to delete the downloads.sqlite file in the Firefox Profile Folder.

See:

You can use this button to go to the Firefox profile folder:

  • Help > Troubleshooting Information > Profile Directory: Show Folder