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some files can harm your computer because it "from" mirror.lease web.com what do i do

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After my computer crashed, I tried to down load Mozilla Firefox and the File Download shows the following message: Some files can harm your computer ...... do not open or save this file. File name: Firefox setup 3.6.15 File type: application From: (several different type like) mirror.lease web.com This type of file could harm your computer as it contains malicious code. How do I download an original version of firefox??

After my computer crashed, I tried to down load Mozilla Firefox and the File Download shows the following message: Some files can harm your computer ...... do not open or save this file. File name: Firefox setup 3.6.15 File type: application From: (several different type like) mirror.lease web.com This type of file could harm your computer as it contains malicious code. How do I download an original version of firefox??

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Follow the instructions and links from Installing Firefox normally Windows users use http://www.getfirefox.com/ to obtain the correct download. The position for linux users is a bit more complicated see Install Firefox on Linux

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That is OK, http://mirror.leaseweb.com is one of the mirrors located around the globe that Mozilla uses to balance server load.