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connection setting automatically goes to auto url configuration

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Whenver I set network connection setting to manual proxy setting. It automatically goes to auto proxy url setting

which does not work

Screenshot is attached for reference

Whenver I set network connection setting to manual proxy setting. It automatically goes to auto proxy url setting which does not work Screenshot is attached for reference

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https://support.mozilla.org/en-US/kb/how-to-fix-preferences-wont-save

Note: Some software, like Advanced SystemCare with Surfing Protection, can protect files in the Firefox profile folder against changes. If you have such software then check the settings or uninstall this software.