Firefox

 First, start Firefox. Select "Options " from the "tools " menu.

Firefox-Step1

It should look like:

Firefox-Step2

Then, select the "advanced " tab and choose "network " in the options list.

Firefox-Step3
Select 'Settings', and enter the proxy server configuration details. 

However, here are instructions to configure your browser to use a proxy for bypassing a censor: 


Opera

Firefox

IE7

IE6

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