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what version of firefox is current

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I keep getting this firefox notice to upgrade to 5.0 (?). The original update notice mentioned something about disabling or not being compatible with some part of my Norton security software. Has that incompatibility been delt with? I want to upgrade but don't know what loss of security I will have.

I keep getting this firefox notice to upgrade to 5.0 (?). The original update notice mentioned something about disabling or not being compatible with some part of my Norton security software. Has that incompatibility been delt with? I want to upgrade but don't know what loss of security I will have.

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Norton released an update patch for Firefox 5.0 on Tuesday 06-21 when Firefox 5.0 was released. (versus taking their normal six to eight weeks) Some Norton users have reported that the toolbar may not work if the Norton patch was installed before Firefox 5.0, instead if after Firefox 5.0 was already installed.

http://community.norton.com/t5/Norton-Internet-Security-Norton/Update-Available-Firefox-5-0-Compatibility-Release-for-Norton/td-p/478160

http://community.norton.com/t5/Norton-Internet-Security-Norton/Norton-Toolbar-for-Firefox-5/td-p/475704/page/16