How to Manually Set Firefox on Windows to Use a Proxy
From Firefox Menu and select Options.
In the Options window click on the Advanced icon.
Select the Network Tab.
In the Connection section click the Settings button.
In the Connection Settings window change to ‘Manual Proxy’ and enter the details.
Close the Connection Settings and Options windows by clicking on the OK button.
How to Set Firefox to Use a Proxy with an Add-on
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