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firefox 4.0 can't connect to internet

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  • 12 有這個問題
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upgraded from 3.6. immediately 4.0 couldn't connect to internet. IE could. uninstalled and reinstalled 3.6. Back online. Just wasted a bloody hour, thanks a lot. I like firefox but....

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That is an indication that a firewall has blocked the new version of Firefox - https://support.mozilla.com/kb/Cannot+connect+after+upgrading+Firefox