diff --git a/web/firefoxcom.js b/web/firefoxcom.js
index a7cd0068b..3add42240 100644
--- a/web/firefoxcom.js
+++ b/web/firefoxcom.js
@@ -150,6 +150,10 @@ class Preferences extends BasePreferences {
   async _readFromStorage(prefObj) {
     return FirefoxCom.requestAsync("getPreferences", prefObj);
   }
+
+  async _writeToStorage(prefObj) {
+    return FirefoxCom.requestAsync("setPreferences", prefObj);
+  }
 }
 
 (function listenFindEvents() {
diff --git a/web/preferences.js b/web/preferences.js
index 61a01ea88..d44e4a39a 100644
--- a/web/preferences.js
+++ b/web/preferences.js
@@ -108,14 +108,14 @@ class BasePreferences {
    *                    provided that the preference exists and the types match.
    */
   async set(name, value) {
-    if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
-      throw new Error("Please use `about:config` to change preferences.");
-    }
     await this.#initializedPromise;
     AppOptions.setAll({ [name]: value }, /* prefs = */ true);
 
-    const prefs = AppOptions.getAll(OptionKind.PREFERENCE);
-    await this._writeToStorage(prefs);
+    await this._writeToStorage(
+      typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")
+        ? { [name]: AppOptions.get(name) }
+        : AppOptions.getAll(OptionKind.PREFERENCE)
+    );
   }
 
   /**