Though I am connected to Internet Firefox says ofline mode

I am running on Ubuntu 13.04 (kernel 3.8.0-19-generic)
I connect to internet Using Huawei E303 and it's In built Driver Software( Mobile Partner )
When I connect to internet using mentioned device firefox says it s in Offline mode.
But If I refresh 5-6 times it connects to internet. But google-chrome connects at first timeall other applications use internet seamlessly.
I thought this might be a proxy issue and I Checked for that; and applied no-proxy system wide.
Firefox connects only after 5-6 times refreshing.

You're welcome

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