BB 43850: Modify the Contrast Control settings for RFP.

Preferences.addSetting({

  id: "contrastControlSettings",

  pref: "browser.display.document_color_use",

  // 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;

  },

});

Preferences.addSetting({

  id: "colors",

  // 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;

  },

  onUserClick() {

    window.gSubDialog.open(

      "chrome://browser/content/preferences/dialogs/colors.xhtml",