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when i click on a pdf link using Firefox 5.0, a blank window opens but the download does not start? I have Adobe Reader X ver 10.1.0, and Adobe Flash Player 10 Plugin installed.

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When I click on a link to open a PDF file or to download a PDF file, a blank browser window opens with an address but nothing happens. The file is not displayed nor does the download window open.

When I click on a link to open a PDF file or to download a PDF file, a blank browser window opens with an address but nothing happens. The file is not displayed nor does the download window open.

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1. The UserAgent being broadcast by Firefox indicates that you are using Firefox 3.5.6, not Firefox 5.0 .
Your UserAgent string in Firefox is messed up by another program that you installed. http://en.wikipedia.org/wiki/User_Agent

type about:config in the URL bar and hit Enter
If you see the warning, you can confirm that you want to access that page.
Filter = general.useragent.extra.firefox
Right-click that preference and select Reset
Then restart Firefox

2. https://support.mozilla.com/en-US/kb/Using+the+Adobe+Reader+plugin+with+Firefox

https://support.mozilla.com/en-US/kb/Opening+PDF+files+within+Firefox

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I did not have that specific useragent, however when I filtered for "general.useragent" there were 4 others that were user set. I Reset each of them and restarted Firefox. I was able to download pdf files, but when I tried again the next day, again I can't download.

Today when I check about:config and filter for "general.useragent" there are only 2 listed: . general.useragent.locale . general.useragent.compatMode.firefox

Any other suggestions?