That checkbox means "SHOW or HIDE" additional settings, it does not mean
"ACTIVATE or DEACTIVATE" additional settings. Its like "+" - EXPAND and "-" - HIDE.
how do I set user agent now that set header is deprecated?
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Now that set header is deprecated, I’m not sure what module to use to set user agent.
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@ryanscripts even if its deprecated you can still use it, but keep in mind that it changes only header, not internal user-agent like in navigator and etc