+  // Modify the contrast setting options when resist fingerprinting (RFP) is

+  // enabled because the custom colours will not be used in this state.

+  // Instead, some fixed set of stand-in colours is used. tor-browser#43850.

+  deps: ["resistFingerprinting"],

+  getControlConfig(config, { resistFingerprinting }, setting) {

+    if (resistFingerprinting.value) {

+      // Hide the "Automatic" option under RFP if it is not already

+      // selected. We generally want to discourage this reflection of system

+      // settings if RFP is enabled.

+      // NOTE: It would be unexpected for this value to be selected under

+      // RFP since there is no visible UI to do so in this state. It would

+      // likely require some direct preference manipulation.

+      config.options[0].hidden = setting.value != config.options[0].value;

+      // Show the last option as "fixed colors".

+      config.options[2].l10nId = "preferences-contrast-control-fixed-color2";

+    } else {

+      // Set back to the default config.

+      config.options[0].hidden = false;

+      config.options[2].l10nId = "preferences-contrast-control-custom";

+    }

+    return config;

+  },

+  // Hide the "colors" button and dialog when resist fingerprint (RFP) is

+  // enabled because the custom colours will not be used. tor-browser#43850.

+  deps: ["resistFingerprinting"],

+  visible: ({ resistFingerprinting }) => {

+    return !resistFingerprinting.value;

+  },

+preferences-contrast-control-fixed-color2 =

+    .description = This will be detectable by websites and will make you appear more unique to web trackers.