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trying to take a job assesment, site only allow version 3.6 how can i make this work, HELP

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this the error "returning=false&EUPLocale=true" for the requirements it specifies ver 3.6, new to FireFox can i down grade my version

this the error "returning=false&EUPLocale=true" for the requirements it specifies ver 3.6, new to FireFox can i down grade my version

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Install Firefox Portable 3.6.18, it won't interfere with your current Firefox 5.0 installation.
http://portableapps.com/apps/internet/firefox_portable/localization#legacy36