diff --git a/qt/aqt/mediasrv.py b/qt/aqt/mediasrv.py
index aab4e58c0..232f5b383 100644
--- a/qt/aqt/mediasrv.py
+++ b/qt/aqt/mediasrv.py
@@ -723,6 +723,8 @@ exposed_backend_list = [
     # CollectionService
     "latest_progress",
     "get_custom_colours",
+    "set_config_json",
+    "get_config_json",
     # DeckService
     "get_deck_names",
     # I18nService
diff --git a/ts/routes/reviewer-inner/index.ts b/ts/routes/reviewer-inner/index.ts
index c5b230943..143afaae9 100644
--- a/ts/routes/reviewer-inner/index.ts
+++ b/ts/routes/reviewer-inner/index.ts
@@ -17,12 +17,17 @@ function postParentMessage(message: ReviewerRequest) {
 
 declare const MathJax: any;
 const urlParams = new URLSearchParams(location.search);
-
+const decoder = new TextDecoder();
 const style = document.createElement("style");
 document.head.appendChild(style);
 
 addEventListener("message", async (e: MessageEvent<InnerReviewerRequest>) => {
     switch (e.data.type) {
+        case "setstorage": {
+            const json = JSON.parse(decoder.decode(e.data.json_buffer));
+            Object.assign(storageObj, json);
+            break;
+        }
         case "html": {
             document.body.innerHTML = e.data.value;
             if (e.data.css) {
@@ -56,7 +61,7 @@ addEventListener("message", async (e: MessageEvent<InnerReviewerRequest>) => {
             break;
         }
         default: {
-            console.warn(`Unknown message type: ${e.data.type}`);
+            // console.warn(`Unknown message type: ${e.data.type}`);
             break;
         }
     }
@@ -99,3 +104,61 @@ function _typeAnsPress() {
     );
 }
 globalThis._typeAnsPress = _typeAnsPress;
+
+const storageObj = {};
+const encoder = new TextEncoder();
+
+function updateParentStorage() {
+    postParentMessage({ type: "setstorage", json_buffer: encoder.encode(JSON.stringify(storageObj)) });
+}
+
+function createStorageProxy() {
+    return new Proxy({}, {
+        get(_target, prop) {
+            switch (prop) {
+                case "getItem":
+                    return (key) => key in storageObj ? storageObj[key] : null;
+                case "setItem":
+                    return (key, value) => {
+                        storageObj[key] = String(value);
+                        updateParentStorage();
+                    };
+                case "removeItem":
+                    return (key) => {
+                        delete storageObj[key];
+                        updateParentStorage();
+                    };
+                case "clear":
+                    return () => {
+                        Object.keys(storageObj).forEach(key => delete storageObj[key]);
+                        updateParentStorage();
+                    };
+                case "key":
+                    return (index) => Object.keys(storageObj)[index] ?? null;
+                case "length":
+                    return Object.keys(storageObj).length;
+                default:
+                    return storageObj[prop];
+            }
+        },
+        set(_target, prop, value) {
+            storageObj[prop] = String(value);
+            return true;
+        },
+        ownKeys() {
+            return Object.keys(storageObj);
+        },
+        getOwnPropertyDescriptor(_target, _prop) {
+            return { enumerable: true, configurable: true };
+        },
+    });
+}
+
+const ankiStorage = createStorageProxy();
+
+Object.defineProperty(window, "localStorage", {
+    value: ankiStorage,
+    writable: false,
+    configurable: true,
+    enumerable: true,
+});
diff --git a/ts/routes/reviewer-inner/innerReviewerRequest.ts b/ts/routes/reviewer-inner/innerReviewerRequest.ts
index 16afcbb88..aa9de1867 100644
--- a/ts/routes/reviewer-inner/innerReviewerRequest.ts
+++ b/ts/routes/reviewer-inner/innerReviewerRequest.ts
@@ -7,4 +7,9 @@ interface HtmlMessage {
     bodyclass?: string;
 }
 
-export type InnerReviewerRequest = HtmlMessage;
+interface StorageUpdateMessage {
+    type: "setstorage";
+    json_buffer: Uint8Array;
+}
+
+export type InnerReviewerRequest = HtmlMessage | StorageUpdateMessage;
diff --git a/ts/routes/reviewer/reviewer.ts b/ts/routes/reviewer/reviewer.ts
index 36917d7b5..06b86b442 100644
--- a/ts/routes/reviewer/reviewer.ts
+++ b/ts/routes/reviewer/reviewer.ts
@@ -1,7 +1,7 @@
 // Copyright: Ankitects Pty Ltd and contributors
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 import { CardAnswer, type NextCardDataResponse_NextCardData } from "@generated/anki/scheduler_pb";
-import { compareAnswer, nextCardData, playAvtags } from "@generated/backend";
+import { compareAnswer, getConfigJson, nextCardData, playAvtags, setConfigJson } from "@generated/backend";
 import { derived, get, writable } from "svelte/store";
 import type { InnerReviewerRequest } from "../reviewer-inner/innerReviewerRequest";
 import type { ReviewerRequest } from "./reviewerRequest";
@@ -39,8 +39,10 @@ export class ReviewerState {
 
     iframe: HTMLIFrameElement | undefined = undefined;
 
-    onReady() {
+    async onReady() {
         this.iframe!.style.visibility = "visible";
+        const { json } = await getConfigJson({ val: "reviewer_storage" });
+        this.sendInnerRequest({ type: "setstorage", json_buffer: json });
         this.showQuestion(null);
         addEventListener("message", this.onMessage.bind(this));
     }
@@ -60,6 +62,13 @@ export class ReviewerState {
                 this.handleKeyPress(e.data.key);
                 break;
             }
+            case "setstorage": {
+                setConfigJson({
+                    key: "reviewer_storage",
+                    valueJson: e.data.json_buffer,
+                    undoable: false,
+                });
+            }
         }
     }
 
diff --git a/ts/routes/reviewer/reviewerRequest.ts b/ts/routes/reviewer/reviewerRequest.ts
index bcd0f7fde..8a3f04c9d 100644
--- a/ts/routes/reviewer/reviewerRequest.ts
+++ b/ts/routes/reviewer/reviewerRequest.ts
@@ -16,4 +16,9 @@ interface KeyPressMessage {
     key: string;
 }
 
-export type ReviewerRequest = AudioMessage | UpdateTypedAnswerMessage | KeyPressMessage;
+interface SetStorageMessage {
+    type: "setstorage";
+    json_buffer: Uint8Array;
+}
+
+export type ReviewerRequest = AudioMessage | UpdateTypedAnswerMessage | KeyPressMessage | SetStorageMessage;