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What does the setting 'use system proxy setting' mean?

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I am using a proxy server that requires my email address which I need to change. I can't figure out how to change the proxy server settings. Under preferences, network, settings, the checked box is 'use system proxy settings' -- I don't know what this means or how to see what the proxy setting is and possibly change it. Thank you

I am using a proxy server that requires my email address which I need to change. I can't figure out how to change the proxy server settings. Under preferences, network, settings, the checked box is 'use system proxy settings' -- I don't know what this means or how to see what the proxy setting is and possibly change it. Thank you

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If the default "Use system proxy settings" is selected then Firefox will try to query the OS to find which settings to use.
If you want to use a specific proxy in Firefox then you can select use "Manual proxy configuration" and enter the URL and port number that you want to use.