I cannot successfully download .dmg files including Firefox updates. I can do it on Safari. Why?

When I try to download .dmg files with firefox, I get a box that asks if I want to Open with [choose] or Save File. Not sure what if any application to use to open it. So I try to save it but it doesn't save the .dmg file. So I use Safari. When I click the download button (as I did to get Firefox 4.0 for the Mac) in Safari, it automatically starts to download and creates the image to drag the image into the application folder. Why can't my Firefox do this whereas Safari cannot? This happens on my desktop at home and at work, both Macs; both using Max 10.6.6.

Pandora may either not be available in the language or country you are using. This is likely the reason.
Or your iPhone may be restricted. Check Settings > General > Restrictions

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Try to clear the cache and the cookies from sites that cause problems.
* "Clear the Cache": Firefox > Preferences > Advanced > Network > Offline Storage (Cache): "Clear Now"
* "Remove the Cookies" from sites causing problems: Firefox > Preferences > Privacy > Cookies: "Show Cookies"
Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]
See also http://kb.mozillazine.org/Error_loading_websites - "Error_loading_some_websites"

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I don't think Firefox supports the vCard format by default... But you may want to try this extension, as I think it's what you want:
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Hi aikidojoe,
Sorry to say I have not been able to solve the problem.   However, the problem only exists with Safari, as
I also have Google Chrome and Firefox and am able to download dmg files on those.
I also have another problem with Safari that appears to have begun at the same time, I can't view or download
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I plan to upgrade to a 64 bit computer this month and will try to remember to let you know what happens with the 3 browsers with the new setup.
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These statements require an Adobe Viewer plugin
That's going to be a problem unfortunately, with Safari 5.1
Read here > Apple Safari 5.1 and Adobe Reader/Acrobat Advisory
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This issue has been reported before by other users, and it turns out it's the effect of malware. In other words, your system is infected. To scan for malware, install, update and run these programs ''in this order''. They are all free for personal use, but some have limited functionality in their "free mode", but the features you'll miss are not really needed to find and remove the problem you have. Remember that ''not all programs detect the same malware''!
Malwarebytes' Anti-Malware - [http://www.malwarebytes.org/mbam.php malwarebytes.org/mbam.php]
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