To enable the PAC file in Firefox
Save the roaming user PAC file to a location on your PC, for example C:\roaming_PAC.txt.
To set up Firefox to look at the PAC file:
1. In Firefox, select Tools > Options.
2. Select the Advanced category.
3. Select the Network tab.
4. In the Connection section, select Settings.
5. Click Automatic Proxy Configuration URL.
6. Type the address of your PAC file, for example file://C:\roaming_PAC.txt.
7. Select Reload.
8. Select OK.
9. Select OK.
To verify that the PAC file is applied and that requests are proxied, navigate to a website that you normally block.
For example, if you normally block web-based email sites, try to browse to http://mail.yahoo.com. You should see a message telling you that the page is blocked.
To disable the PAC file in Firefox
In Firefox, select Tools > Options.
Select the Advanced category.
Select the Network tab.
Click Connection Settings.
Select the Direct Connection to the Internet option.
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