Why am I prevented from downloading/installing the DownloadHelper add on?

When I try to download the Video DownloadHelper add on, nothing happens. A Firefox message advises that Mozilla has prevented me from downloading the add on.

You should see a bar at the top with a button to allow that installation in such a case. If that doesn't work then download the .xpi file to your computer (right-click: Save Link as) and install the extension via File > Open File.

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    Thank you again for your unselfish time in coming to my rescue. "Deaf Dave"
    From: [email protected]
    Date: 7/1/2010 12:53:40 PM
    To: [email protected]
    Subject: Reply notification: when clicking websites my Avast 5.0 antivirus notifies me that a malicious URL is trying to access my system or that a Trojan has been prevented from access. The attempted Malware/Trojan is always from the same address:[ticon.in/nte/kuz/.exe/xhdoe515bvo38d
    "Morbus" has posted a reply to a thread you're watching.
    You can view the thread and reply at the following URL:
    https://support.mozilla.com/en-US/forum/1/714170#threadId714337
    Message:
    Hello Deaf Dave.
    It's possible that you are having a problem with some Firefox add-on that is hindering your Firefox's normal behavior. Have you tried disabling all add-ons (just to check), to see if Firefox goes back to normal?
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