In Firefox, it is configuration entry
privacy.resistFingerprinting
Some details (the list is not exhaustive):> * Your timezone is reported to be UTC; * Not all fonts installed on your computer are available to webpages; * The browser window prefers to be set to a specific size; * Your browser reports a specific, common version number and operating system; * Your keyboard layout and language is disguised; * Your webcam and microphone capabilities are disguised; * The Media Statistics Web API reports misleading information; * Any Site-Specific Zoom settings are not applied; * The WebSpeech, Gamepad, Sensors, and Performance Web APIs are disabled, etc.