diff --git a/public/index.html b/public/index.html
index fac93ff29..ee5c89ed4 100644
--- a/public/index.html
+++ b/public/index.html
@@ -45,6 +45,7 @@
     <script src="lib/pagination.js"></script>
     <script src="lib/toolcool-color-picker.js"></script>
     <script src="lib/svg-inject.js"></script>
+    <script type="module" src="lib/structured-clone/monkey-patch.js"></script>
     <script type="module" src="lib/swiped-events.js"></script>
     <script type="module" src="lib/eventemitter.js"></script>
     <script type="module" src="scripts/power-user.js"></script>
diff --git a/public/lib/structured-clone/LICENSE b/public/lib/structured-clone/LICENSE
new file mode 100644
index 000000000..48afbe52a
--- /dev/null
+++ b/public/lib/structured-clone/LICENSE
@@ -0,0 +1,15 @@
+ISC License
+
+Copyright (c) 2021, Andrea Giammarchi, @WebReflection
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.
diff --git a/public/lib/structured-clone/deserialize.js b/public/lib/structured-clone/deserialize.js
new file mode 100644
index 000000000..0fa70897d
--- /dev/null
+++ b/public/lib/structured-clone/deserialize.js
@@ -0,0 +1,79 @@
+import {
+  VOID, PRIMITIVE,
+  ARRAY, OBJECT,
+  DATE, REGEXP, MAP, SET,
+  ERROR, BIGINT
+} from './types.js';
+
+const env = typeof self === 'object' ? self : globalThis;
+
+const deserializer = ($, _) => {
+  const as = (out, index) => {
+    $.set(index, out);
+    return out;
+  };
+
+  const unpair = index => {
+    if ($.has(index))
+      return $.get(index);
+
+    const [type, value] = _[index];
+    switch (type) {
+      case PRIMITIVE:
+      case VOID:
+        return as(value, index);
+      case ARRAY: {
+        const arr = as([], index);
+        for (const index of value)
+          arr.push(unpair(index));
+        return arr;
+      }
+      case OBJECT: {
+        const object = as({}, index);
+        for (const [key, index] of value)
+          object[unpair(key)] = unpair(index);
+        return object;
+      }
+      case DATE:
+        return as(new Date(value), index);
+      case REGEXP: {
+        const {source, flags} = value;
+        return as(new RegExp(source, flags), index);
+      }
+      case MAP: {
+        const map = as(new Map, index);
+        for (const [key, index] of value)
+          map.set(unpair(key), unpair(index));
+        return map;
+      }
+      case SET: {
+        const set = as(new Set, index);
+        for (const index of value)
+          set.add(unpair(index));
+        return set;
+      }
+      case ERROR: {
+        const {name, message} = value;
+        return as(new env[name](message), index);
+      }
+      case BIGINT:
+        return as(BigInt(value), index);
+      case 'BigInt':
+        return as(Object(BigInt(value)), index);
+    }
+    return as(new env[type](value), index);
+  };
+
+  return unpair;
+};
+
+/**
+ * @typedef {Array<string,any>} Record a type representation
+ */
+
+/**
+ * Returns a deserialized value from a serialized array of Records.
+ * @param {Record[]} serialized a previously serialized value.
+ * @returns {any}
+ */
+export const deserialize = serialized => deserializer(new Map, serialized)(0);
diff --git a/public/lib/structured-clone/index.js b/public/lib/structured-clone/index.js
new file mode 100644
index 000000000..d3b47479a
--- /dev/null
+++ b/public/lib/structured-clone/index.js
@@ -0,0 +1,25 @@
+import {deserialize} from './deserialize.js';
+import {serialize} from './serialize.js';
+
+/**
+ * @typedef {Array<string,any>} Record a type representation
+ */
+
+/**
+ * Returns an array of serialized Records.
+ * @param {any} any a serializable value.
+ * @param {{transfer?: any[], json?: boolean, lossy?: boolean}?} options an object with
+ * a transfer option (ignored when polyfilled) and/or non standard fields that
+ * fallback to the polyfill if present.
+ * @returns {Record[]}
+ */
+export default typeof structuredClone === "function" ?
+  /* c8 ignore start */
+  (any, options) => (
+    options && ('json' in options || 'lossy' in options) ?
+      deserialize(serialize(any, options)) : structuredClone(any)
+  ) :
+  (any, options) => deserialize(serialize(any, options));
+  /* c8 ignore stop */
+
+export {deserialize, serialize};
diff --git a/public/lib/structured-clone/json.js b/public/lib/structured-clone/json.js
new file mode 100644
index 000000000..23eb95222
--- /dev/null
+++ b/public/lib/structured-clone/json.js
@@ -0,0 +1,21 @@
+/*! (c) Andrea Giammarchi - ISC */
+
+import {deserialize} from './deserialize.js';
+import {serialize} from './serialize.js';
+
+const {parse: $parse, stringify: $stringify} = JSON;
+const options = {json: true, lossy: true};
+
+/**
+ * Revive a previously stringified structured clone.
+ * @param {string} str previously stringified data as string.
+ * @returns {any} whatever was previously stringified as clone.
+ */
+export const parse = str => deserialize($parse(str));
+
+/**
+ * Represent a structured clone value as string.
+ * @param {any} any some clone-able value to stringify.
+ * @returns {string} the value stringified.
+ */
+export const stringify = any => $stringify(serialize(any, options));
diff --git a/public/lib/structured-clone/monkey-patch.js b/public/lib/structured-clone/monkey-patch.js
new file mode 100644
index 000000000..8489dc892
--- /dev/null
+++ b/public/lib/structured-clone/monkey-patch.js
@@ -0,0 +1,6 @@
+import structuredClone from './index.js';
+
+if (!("structuredClone" in globalThis)) {
+    console.debug("Monkey-patching structuredClone");
+    globalThis.structuredClone = structuredClone;
+}
diff --git a/public/lib/structured-clone/serialize.js b/public/lib/structured-clone/serialize.js
new file mode 100644
index 000000000..8e098ddca
--- /dev/null
+++ b/public/lib/structured-clone/serialize.js
@@ -0,0 +1,161 @@
+import {
+  VOID, PRIMITIVE,
+  ARRAY, OBJECT,
+  DATE, REGEXP, MAP, SET,
+  ERROR, BIGINT
+} from './types.js';
+
+const EMPTY = '';
+
+const {toString} = {};
+const {keys} = Object;
+
+const typeOf = value => {
+  const type = typeof value;
+  if (type !== 'object' || !value)
+    return [PRIMITIVE, type];
+
+  const asString = toString.call(value).slice(8, -1);
+  switch (asString) {
+    case 'Array':
+      return [ARRAY, EMPTY];
+    case 'Object':
+      return [OBJECT, EMPTY];
+    case 'Date':
+      return [DATE, EMPTY];
+    case 'RegExp':
+      return [REGEXP, EMPTY];
+    case 'Map':
+      return [MAP, EMPTY];
+    case 'Set':
+      return [SET, EMPTY];
+  }
+
+  if (asString.includes('Array'))
+    return [ARRAY, asString];
+
+  if (asString.includes('Error'))
+    return [ERROR, asString];
+
+  return [OBJECT, asString];
+};
+
+const shouldSkip = ([TYPE, type]) => (
+  TYPE === PRIMITIVE &&
+  (type === 'function' || type === 'symbol')
+);
+
+const serializer = (strict, json, $, _) => {
+
+  const as = (out, value) => {
+    const index = _.push(out) - 1;
+    $.set(value, index);
+    return index;
+  };
+
+  const pair = value => {
+    if ($.has(value))
+      return $.get(value);
+
+    let [TYPE, type] = typeOf(value);
+    switch (TYPE) {
+      case PRIMITIVE: {
+        let entry = value;
+        switch (type) {
+          case 'bigint':
+            TYPE = BIGINT;
+            entry = value.toString();
+            break;
+          case 'function':
+          case 'symbol':
+            if (strict)
+              throw new TypeError('unable to serialize ' + type);
+            entry = null;
+            break;
+          case 'undefined':
+            return as([VOID], value);
+        }
+        return as([TYPE, entry], value);
+      }
+      case ARRAY: {
+        if (type)
+          return as([type, [...value]], value);
+  
+        const arr = [];
+        const index = as([TYPE, arr], value);
+        for (const entry of value)
+          arr.push(pair(entry));
+        return index;
+      }
+      case OBJECT: {
+        if (type) {
+          switch (type) {
+            case 'BigInt':
+              return as([type, value.toString()], value);
+            case 'Boolean':
+            case 'Number':
+            case 'String':
+              return as([type, value.valueOf()], value);
+          }
+        }
+
+        if (json && ('toJSON' in value))
+          return pair(value.toJSON());
+
+        const entries = [];
+        const index = as([TYPE, entries], value);
+        for (const key of keys(value)) {
+          if (strict || !shouldSkip(typeOf(value[key])))
+            entries.push([pair(key), pair(value[key])]);
+        }
+        return index;
+      }
+      case DATE:
+        return as([TYPE, value.toISOString()], value);
+      case REGEXP: {
+        const {source, flags} = value;
+        return as([TYPE, {source, flags}], value);
+      }
+      case MAP: {
+        const entries = [];
+        const index = as([TYPE, entries], value);
+        for (const [key, entry] of value) {
+          if (strict || !(shouldSkip(typeOf(key)) || shouldSkip(typeOf(entry))))
+            entries.push([pair(key), pair(entry)]);
+        }
+        return index;
+      }
+      case SET: {
+        const entries = [];
+        const index = as([TYPE, entries], value);
+        for (const entry of value) {
+          if (strict || !shouldSkip(typeOf(entry)))
+            entries.push(pair(entry));
+        }
+        return index;
+      }
+    }
+
+    const {message} = value;
+    return as([TYPE, {name: type, message}], value);
+  };
+
+  return pair;
+};
+
+/**
+ * @typedef {Array<string,any>} Record a type representation
+ */
+
+/**
+ * Returns an array of serialized Records.
+ * @param {any} value a serializable value.
+ * @param {{json?: boolean, lossy?: boolean}?} options an object with a `lossy` or `json` property that,
+ *  if `true`, will not throw errors on incompatible types, and behave more
+ *  like JSON stringify would behave. Symbol and Function will be discarded.
+ * @returns {Record[]}
+ */
+ export const serialize = (value, {json, lossy} = {}) => {
+  const _ = [];
+  return serializer(!(json || lossy), !!json, new Map, _)(value), _;
+};
diff --git a/public/lib/structured-clone/types.js b/public/lib/structured-clone/types.js
new file mode 100644
index 000000000..50e60ca06
--- /dev/null
+++ b/public/lib/structured-clone/types.js
@@ -0,0 +1,11 @@
+export const VOID       = -1;
+export const PRIMITIVE  = 0;
+export const ARRAY      = 1;
+export const OBJECT     = 2;
+export const DATE       = 3;
+export const REGEXP     = 4;
+export const MAP        = 5;
+export const SET        = 6;
+export const ERROR      = 7;
+export const BIGINT     = 8;
+// export const SYMBOL = 9;