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i cannot load firefox

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when i try to download firefox it says it cant because its an unknown publisher

when i try to download firefox it says it cant because its an unknown publisher

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You can download the current version of Firefox from here.
http://www.mozilla.com/en-US/firefox/upgrade.html

When you see that alert message, just override it and download Firefox anyways. That "unknown publisher" alert comes up because Mozilla hasn't joined Microsoft's "club" and paid MS for that "privilege".