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Q203: Tampermonkey extension shows a warning. Why?

A203 Tampermonkey checks whether HTTP headers like "user-agent" or "referer" can be modified by userscripts. If now another extension like a user agent spoofer or an script blocker like ScriptNo modifies this request too the warning is displayed. This should not occur that often when the option "Allow HTTP headers to be modified by scripts" is set to "Yes" (Default) or even never if it is set to "No".