Firefox 3.6.11.dmg is not being recognized because "the following disk images failed to mount." why is this happening?

I am trying to install Firefox 3.6.11 but I am not able to go beyond downloading it's .dmg file because of that message I saw from a seperate screen.

Try to repair the disk permissions: http://thexlab.com/faqs/repairprocess.html
See also:
* http://support.apple.com/kb/HT2963 Troubleshooting permissions issues in Mac OS X
* http://thexlab.com/faqs/resetlaunchservices.html
You can also try this:
* Download a new copy of the Firefox program: http://www.mozilla.com/firefox/all.html
* Trash the current Firefox application to do a clean reinstall.
* Install the new version that you have downloaded.
Your profile data is stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder], so you won't lose your bookmarks and other personal data.

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