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When I downloaded Firefox 4.0 Norton 360 didn't load so I went back to 3.6.16 and everything is fine

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When I downloaded Firefox 4.0 Norton 360 didn't load so I went back to 3.6.15 and everyting is fine

When I downloaded Firefox 4.0 Norton 360 didn't load so I went back to 3.6.15 and everyting is fine

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Symantec need to update their Firefox add-ons so that they are compatible with Firefox 4. They have indicated that for Norton 360 they plan to release an update to Norton 360 to support Firefox 4 in early May - http://us.norton.com/support/kb/web_view.jsp?wv_type=public_web&docurl=20100720113635EN&ln=en_US

Pending the update by Symantec you will need to use Firefox 3.6 if you want to use the Norton add-ons.