diff --git a/app/actions/definitions/navigation.tsx b/app/actions/definitions/navigation.tsx
index 234a23bda..d2f0c6dda 100644
--- a/app/actions/definitions/navigation.tsx
+++ b/app/actions/definitions/navigation.tsx
@@ -14,6 +14,7 @@ import {
   BrowserIcon,
 } from "outline-icons";
 import * as React from "react";
+import { isMac } from "@shared/utils/browser";
 import {
   developersUrl,
   changelogUrl,
@@ -26,7 +27,6 @@ import KeyboardShortcuts from "~/scenes/KeyboardShortcuts";
 import { createAction } from "~/actions";
 import { NavigationSection, RecentSearchesSection } from "~/actions/sections";
 import Desktop from "~/utils/Desktop";
-import { isMac } from "~/utils/browser";
 import history from "~/utils/history";
 import isCloudHosted from "~/utils/isCloudHosted";
 import {
diff --git a/app/components/Header.tsx b/app/components/Header.tsx
index 0ffc82cc7..e86e634be 100644
--- a/app/components/Header.tsx
+++ b/app/components/Header.tsx
@@ -6,6 +6,7 @@ import * as React from "react";
 import styled from "styled-components";
 import breakpoint from "styled-components-breakpoint";
 import { depths, s } from "@shared/styles";
+import { supportsPassiveListener } from "@shared/utils/browser";
 import Button from "~/components/Button";
 import Fade from "~/components/Fade";
 import Flex from "~/components/Flex";
@@ -14,7 +15,6 @@ import useMobile from "~/hooks/useMobile";
 import useStores from "~/hooks/useStores";
 import { draggableOnDesktop, fadeOnDesktopBackgrounded } from "~/styles";
 import Desktop from "~/utils/Desktop";
-import { supportsPassiveListener } from "~/utils/browser";
 
 type Props = {
   left?: React.ReactNode;
diff --git a/app/components/Sidebar/components/HistoryNavigation.tsx b/app/components/Sidebar/components/HistoryNavigation.tsx
index 1bd8640cf..7e73945d6 100644
--- a/app/components/Sidebar/components/HistoryNavigation.tsx
+++ b/app/components/Sidebar/components/HistoryNavigation.tsx
@@ -3,12 +3,12 @@ import * as React from "react";
 import { useTranslation } from "react-i18next";
 import styled from "styled-components";
 import { s } from "@shared/styles";
+import { isMac } from "@shared/utils/browser";
 import Flex from "~/components/Flex";
 import NudeButton from "~/components/NudeButton";
 import Tooltip from "~/components/Tooltip";
 import useKeyDown from "~/hooks/useKeyDown";
 import Desktop from "~/utils/Desktop";
-import { isMac } from "~/utils/browser";
 
 function HistoryNavigation(props: React.ComponentProps<typeof Flex>) {
   const { t } = useTranslation();
diff --git a/app/hooks/useWindowScrollPosition.ts b/app/hooks/useWindowScrollPosition.ts
index e00641309..4f3cf2b33 100644
--- a/app/hooks/useWindowScrollPosition.ts
+++ b/app/hooks/useWindowScrollPosition.ts
@@ -2,7 +2,7 @@
 // maintained.
 import throttle from "lodash/throttle";
 import { useState, useEffect } from "react";
-import { supportsPassiveListener } from "~/utils/browser";
+import { supportsPassiveListener } from "@shared/utils/browser";
 
 const getPosition = () => ({
   x: window.pageXOffset,
diff --git a/app/scenes/Document/components/MultiplayerEditor.tsx b/app/scenes/Document/components/MultiplayerEditor.tsx
index 8660ccff9..9b508b59f 100644
--- a/app/scenes/Document/components/MultiplayerEditor.tsx
+++ b/app/scenes/Document/components/MultiplayerEditor.tsx
@@ -6,6 +6,7 @@ import { useHistory } from "react-router-dom";
 import { IndexeddbPersistence } from "y-indexeddb";
 import * as Y from "yjs";
 import MultiplayerExtension from "@shared/editor/extensions/Multiplayer";
+import { supportsPassiveListener } from "@shared/utils/browser";
 import Editor, { Props as EditorProps } from "~/components/Editor";
 import env from "~/env";
 import useCurrentUser from "~/hooks/useCurrentUser";
@@ -16,7 +17,6 @@ import useStores from "~/hooks/useStores";
 import useToasts from "~/hooks/useToasts";
 import { AwarenessChangeEvent } from "~/types";
 import Logger from "~/utils/Logger";
-import { supportsPassiveListener } from "~/utils/browser";
 import { homePath } from "~/utils/routeHelpers";
 
 type Props = EditorProps & {
diff --git a/app/scenes/KeyboardShortcuts.tsx b/app/scenes/KeyboardShortcuts.tsx
index 385c0ff32..f7ae2f280 100644
--- a/app/scenes/KeyboardShortcuts.tsx
+++ b/app/scenes/KeyboardShortcuts.tsx
@@ -2,10 +2,10 @@ import * as React from "react";
 import { useTranslation } from "react-i18next";
 import styled from "styled-components";
 import { s } from "@shared/styles";
+import { isMac } from "@shared/utils/browser";
 import Flex from "~/components/Flex";
 import InputSearch from "~/components/InputSearch";
 import Key from "~/components/Key";
-import { isMac } from "~/utils/browser";
 import { metaDisplay, altDisplay } from "~/utils/keyboard";
 
 function KeyboardShortcuts() {
diff --git a/app/styles/index.ts b/app/styles/index.ts
index 3c0026d6d..296e17477 100644
--- a/app/styles/index.ts
+++ b/app/styles/index.ts
@@ -1,5 +1,5 @@
+import { isTouchDevice } from "@shared/utils/browser";
 import Desktop from "~/utils/Desktop";
-import { isTouchDevice } from "~/utils/browser";
 
 /**
  * Returns "hover" on a non-touch device and "active" on a touch device. To
diff --git a/app/utils/Desktop.ts b/app/utils/Desktop.ts
index e0dd60816..d31809d6e 100644
--- a/app/utils/Desktop.ts
+++ b/app/utils/Desktop.ts
@@ -1,4 +1,4 @@
-import { isMac, isWindows } from "./browser";
+import { isMac, isWindows } from "@shared/utils/browser";
 
 export default class Desktop {
   /**
diff --git a/app/utils/keyboard.ts b/app/utils/keyboard.ts
index 627ea1ba5..d90944c05 100644
--- a/app/utils/keyboard.ts
+++ b/app/utils/keyboard.ts
@@ -1,4 +1,4 @@
-import { isMac } from "~/utils/browser";
+import { isMac } from "@shared/utils/browser";
 
 export const altDisplay = isMac() ? "⌥" : "Alt";
 
diff --git a/shared/editor/lib/isModKey.ts b/shared/editor/lib/isModKey.ts
deleted file mode 100644
index 468a0af6b..000000000
--- a/shared/editor/lib/isModKey.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-const SSR = typeof window === "undefined";
-const isMac = !SSR && window.navigator.platform === "MacIntel";
-
-export default function isModKey(event: KeyboardEvent | MouseEvent): boolean {
-  return isMac ? event.metaKey : event.ctrlKey;
-}
diff --git a/shared/editor/nodes/CodeFence.ts b/shared/editor/nodes/CodeFence.ts
index 2dbc2fb2f..fd1a452a8 100644
--- a/shared/editor/nodes/CodeFence.ts
+++ b/shared/editor/nodes/CodeFence.ts
@@ -58,6 +58,7 @@ import { Primitive } from "utility-types";
 import { Dictionary } from "~/hooks/useDictionary";
 import { UserPreferences } from "../../types";
 import Storage from "../../utils/Storage";
+import { isMac } from "../../utils/browser";
 import {
   newlineInCode,
   insertSpaceTab,
@@ -208,14 +209,22 @@ export default class CodeFence extends Node {
   }
 
   keys({ type, schema }: { type: NodeType; schema: Schema }) {
-    return {
+    const output = {
       "Shift-Ctrl-\\": toggleBlockType(type, schema.nodes.paragraph),
       Tab: insertSpaceTab,
       Enter: newlineInCode,
       "Shift-Enter": newlineInCode,
-      "Ctrl-a": moveToPreviousNewline,
-      "Ctrl-e": moveToNextNewline,
     };
+
+    if (isMac()) {
+      return {
+        ...output,
+        "Ctrl-a": moveToPreviousNewline,
+        "Ctrl-e": moveToNextNewline,
+      };
+    }
+
+    return output;
   }
 
   get plugins() {
diff --git a/app/utils/browser.ts b/shared/utils/browser.ts
similarity index 89%
rename from app/utils/browser.ts
rename to shared/utils/browser.ts
index ac642149a..42c4aed34 100644
--- a/app/utils/browser.ts
+++ b/shared/utils/browser.ts
@@ -1,8 +1,10 @@
+const SSR = typeof window === "undefined";
+
 /**
  * Returns true if the client is a touch device.
  */
 export function isTouchDevice(): boolean {
-  if (typeof window === "undefined") {
+  if (SSR) {
     return false;
   }
   return window.matchMedia?.("(hover: none) and (pointer: coarse)")?.matches;
@@ -12,6 +14,9 @@ export function isTouchDevice(): boolean {
  * Returns true if the client is running on a Mac.
  */
 export function isMac(): boolean {
+  if (SSR) {
+    return false;
+  }
   return window.navigator.platform === "MacIntel";
 }
 
@@ -19,6 +24,9 @@ export function isMac(): boolean {
  * Returns true if the client is running on Windows.
  */
 export function isWindows(): boolean {
+  if (SSR) {
+    return false;
+  }
   return window.navigator.platform === "Win32";
 }