Microsoft Internet Explorer.
Select Internet Options from the Tools menu (in some versions of IE, the Internet Options menu item located in the View menu)
Click on the Connections tab
Select the dial-up connection you are using.
Press the Settings button
Set Proxy Settings: In the appropriate fields in the dialog box type the following: 127.0.0.1 (address of proxy server to use) and 80 (port number). Currently supported protocols (or server types) are HTTP, Secure HTTP and FTP. Do not modify other entries. Do not select the Use the same proxy server for all protocols option
Press OK
Do the same for all Dial-up connections. If you connect to the Internet through a LAN, you should change in the same way the Proxy Settings for your LAN connection.
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Chrome
Choose Preferences from the Edit menu
Open the Advanced subtree on the left and click on Proxies
On the right, select Manual proxy configuration and click the View button (if you ever need to disable A4Proxy, just select Direct Connection in this dialog and the browser will communicate with websites directly, bypassing A4Proxy)
In the appropriate fields in the dialog box that will appear, type the following: 127.0.0.1 (address of the proxy server to use) and 80 (port number). Currently supported protocols (or server types) are HTTP, Secure HTTP and FTP. Gopher resources should also work with A4Proxy although this has not been tested.
Click OK everywhere
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Opera.
Choose Proxy Servers from the Preferences menu
In the appropriate fields in the dialog box that will appear, type the following: 127.0.0.1 (address of the proxy server to use) and 80 (port number). Currently supported protocols (or server types) are HTTP, Secure HTTP and FTP. Gopher resources should also work with A4Proxy although this has not been tested.
Select the checkboxes on the left of these fields (HTTP, HTTPS and FTP)
Click OK