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Firefox
From Anarchopedia
Firefox is an free internet browser, often considered to be significantly more secure than Internet Explorer.
Using Tor with Firefox
In order to use Tor with any application, you must download the software which allows you to connect to the network.
These are the instructions for "Torifying" Firefox 1.5.*
Click on Tools > Options > General > Connection settings
Add the data "localhost" to the "HTTP Proxy" field. Add the data "8118" to the "port" field.
Tick the box to make this the default proxy server for all protocols
You can check your IP address by visiting websites such as WhatIsMyIp