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diff --git a/toolkit/components/formautofill/Helpers.ios.mjs b/toolkit/components/formautofill/Helpers.ios.mjs
new file mode 100644
index 0000000000..b634056e60
--- /dev/null
+++ b/toolkit/components/formautofill/Helpers.ios.mjs
@@ -0,0 +1,166 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import { IOSAppConstants } from "resource://gre/modules/shared/Constants.ios.mjs";
+import Overrides from "resource://gre/modules/Overrides.ios.js";
+
+/* eslint mozilla/use-isInstance: 0 */
+HTMLSelectElement.isInstance = element => element instanceof HTMLSelectElement;
+HTMLInputElement.isInstance = element => element instanceof HTMLInputElement;
+HTMLFormElement.isInstance = element => element instanceof HTMLFormElement;
+ShadowRoot.isInstance = element => element instanceof ShadowRoot;
+
+HTMLElement.prototype.ownerGlobal = window;
+HTMLInputElement.prototype.setUserInput = function (value) {
+  this.value = value;
+  this.dispatchEvent(new Event("input", { bubbles: true }));
+};
+
+// TODO: Bug 1828408.
+// Use  WeakRef API directly in our codebase instead of legacy Cu.getWeakReference.
+window.Cu = class {
+  static getWeakReference(elements) {
+    const elementsWeakRef = new WeakRef(elements);
+    return {
+      get: () => elementsWeakRef.deref(),
+    };
+  }
+};
+
+// Mimic the behavior of .getAutocompleteInfo()
+// It should return an object with a fieldName property matching the autocomplete attribute
+// only if it's a valid value from this list https://searchfox.org/mozilla-central/source/dom/base/AutocompleteFieldList.h#89-149
+// Also found here: https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/autocomplete
+HTMLElement.prototype.getAutocompleteInfo = function () {
+  const autocomplete = this.getAttribute("autocomplete");
+
+  return {
+    fieldName: IOSAppConstants.validAutocompleteFields.includes(autocomplete)
+      ? autocomplete
+      : "",
+  };
+};
+
+// Bug 1835024. Webkit doesn't support `checkVisibility` API
+// https://drafts.csswg.org/cssom-view-1/#dom-element-checkvisibility
+HTMLElement.prototype.checkVisibility = function (options) {
+  throw new Error(`Not implemented: WebKit doesn't support checkVisibility `);
+};
+
+// This function  helps us debug better when an error occurs because a certain mock is missing
+const withNotImplementedError = obj =>
+  new Proxy(obj, {
+    get(target, prop) {
+      if (!Object.keys(target).includes(prop)) {
+        throw new Error(
+          `Not implemented: ${prop} doesn't exist in mocked object `
+        );
+      }
+      return Reflect.get(...arguments);
+    },
+  });
+
+// Webpack needs to be able to statically analyze require statements in order to build the dependency graph
+// In order to require modules dynamically at runtime, we use require.context() to create a dynamic require
+// that is still able to be parsed by Webpack at compile time. The "./" and ".mjs" tells webpack that files
+// in the current directory ending with .mjs might be needed and should be added to the dependency graph.
+// NOTE: This can't handle circular dependencies. A static import can be used in this case.
+// https://webpack.js.org/guides/dependency-management/
+const internalModuleResolvers = {
+  resolveModule(moduleURI) {
+    // eslint-disable-next-line no-undef
+    const moduleResolver = require.context("./", false, /.mjs$/);
+    // Desktop code uses uris for importing modules of the form resource://gre/modules/<module_path>
+    // We only need the filename here
+    const moduleName = moduleURI.split("/").pop();
+    const modulePath =
+      "./" + (Overrides.ModuleOverrides[moduleName] ?? moduleName);
+    return moduleResolver(modulePath);
+  },
+
+  resolveModules(obj, modules) {
+    for (const [exportName, moduleURI] of Object.entries(modules)) {
+      const resolvedModule = this.resolveModule(moduleURI);
+      obj[exportName] = resolvedModule?.[exportName];
+    }
+  },
+};
+
+// Define mock for XPCOMUtils
+export const XPCOMUtils = withNotImplementedError({
+  defineLazyGetter: (obj, prop, getFn) => {
+    obj[prop] = getFn?.();
+  },
+  defineLazyPreferenceGetter: (
+    obj,
+    prop,
+    pref,
+    defaultValue = null,
+    onUpdate = null,
+    transform = val => val
+  ) => {
+    if (!Object.keys(IOSAppConstants.prefs).includes(pref)) {
+      throw Error(`Pref ${pref} is not defined.`);
+    }
+    obj[prop] = transform(IOSAppConstants.prefs[pref] ?? defaultValue);
+  },
+  defineLazyModuleGetters(obj, modules) {
+    internalModuleResolvers.resolveModules(obj, modules);
+  },
+});
+
+// eslint-disable-next-line no-shadow
+export const ChromeUtils = withNotImplementedError({
+  defineESModuleGetters(obj, modules) {
+    internalModuleResolvers.resolveModules(obj, modules);
+  },
+  importESModule(moduleURI) {
+    return internalModuleResolvers.resolveModule(moduleURI);
+  },
+});
+window.ChromeUtils = ChromeUtils;
+
+// Define mock for Region.sys.mjs
+export const Region = withNotImplementedError({
+  home: "US",
+});
+
+// Define mock for OSKeyStore.sys.mjs
+export const OSKeyStore = withNotImplementedError({
+  ensureLoggedIn: () => true,
+});
+
+// Define mock for Services
+// NOTE: Services is a global so we need to attach it to the window
+// eslint-disable-next-line no-shadow
+export const Services = withNotImplementedError({
+  intl: withNotImplementedError({
+    getAvailableLocaleDisplayNames: () => [],
+    getRegionDisplayNames: () => [],
+  }),
+  locale: withNotImplementedError({ isAppLocaleRTL: false }),
+  prefs: withNotImplementedError({ prefIsLocked: () => false }),
+  strings: withNotImplementedError({
+    createBundle: () =>
+      withNotImplementedError({
+        GetStringFromName: () => "",
+        formatStringFromName: () => "",
+      }),
+  }),
+  uuid: withNotImplementedError({ generateUUID: () => "" }),
+});
+window.Services = Services;
+
+export const windowUtils = withNotImplementedError({
+  removeManuallyManagedState: () => {},
+  addManuallyManagedState: () => {},
+});
+window.windowUtils = windowUtils;
+
+export const AutofillTelemetry = withNotImplementedError({
+  recordFormInteractionEvent: () => {},
+  recordDetectedSectionCount: () => {},
+});
+
+export { IOSAppConstants as AppConstants } from "resource://gre/modules/shared/Constants.ios.mjs";