From 471b14cd668df10e0bd59c69725e3cc1cb69f09c Mon Sep 17 00:00:00 2001
From: Hamish Willee <hamishwillee@gmail.com>
Date: Fri, 23 Feb 2024 10:48:39 +1100
Subject: [PATCH] FF124 ExperFeatures - Growable SharedArrayBuffer & Resizable
 ArrayBuffer (#32355)

* FF124 ExprFeat: SharedArrayBuffer growable

* FF124 ExprFeat: ArrayBuffer resizable

* FF124 Relnote - addn of expr features for growable

* Update files/en-us/mozilla/firefox/experimental_features/index.md
---
 .../firefox/experimental_features/index.md    | 86 +++++++++++++++++++
 .../mozilla/firefox/releases/124/index.md     | 14 +++
 2 files changed, 100 insertions(+)

diff --git a/files/en-us/mozilla/firefox/experimental_features/index.md b/files/en-us/mozilla/firefox/experimental_features/index.md
index faa2e3f6b8902ac..7da591397c8e52a 100644
--- a/files/en-us/mozilla/firefox/experimental_features/index.md
+++ b/files/en-us/mozilla/firefox/experimental_features/index.md
@@ -1006,6 +1006,92 @@ This enables splitting a string into meaningful items (graphemes, words or sente
   </tbody>
 </table>
 
+### SharedArrayBuffer is growable
+
+The {{jsxref("SharedArrayBuffer")}} is now growable using the {{jsxref("SharedArrayBuffer.prototype.grow()")}} method.
+The maximum allowed size of the buffer is specified using the `options.maxByteLength` parameter to the [`SharedArrayBuffer()` constructor](/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer/SharedArrayBuffer#maxbytelength).
+The {{jsxref("SharedArrayBuffer.prototype.growable")}} and {{jsxref("SharedArrayBuffer.prototype.maxByteLength")}} properties indicate whether the buffer can be grow, and its maximum allowed size, respectively.
+([Firefox bug 1842773](https://bugzil.la/1842773)).
+
+<table>
+  <thead>
+    <tr>
+      <th>Release channel</th>
+      <th>Version added</th>
+      <th>Enabled by default?</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <th>Nightly</th>
+      <td>124</td>
+      <td>No</td>
+    </tr>
+    <tr>
+      <th>Developer Edition</th>
+      <td>124</td>
+      <td>No</td>
+    </tr>
+    <tr>
+      <th>Beta</th>
+      <td>124</td>
+      <td>No</td>
+    </tr>
+    <tr>
+      <th>Release</th>
+      <td>124</td>
+      <td>No</td>
+    </tr>
+    <tr>
+      <th>Preference name</th>
+      <td colspan="2"><code>javascript.options.experimental.sharedarraybuffer_growable</code></td>
+    </tr>
+  </tbody>
+</table>
+
+### ArrayBuffer is resizable
+
+The {{jsxref("ArrayBuffer")}} can now be resized using the {{jsxref("ArrayBuffer.prototype.resize()")}} method.
+The maximum allowed size of the buffer is specified using the `options.maxByteLength` parameter to the [`ArrayBuffer()` constructor](/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer/ArrayBuffer#maxbytelength).
+The {{jsxref("ArrayBuffer.prototype.resizable")}} and {{jsxref("ArrayBuffer.prototype.maxByteLength")}} properties indicate whether the buffer can be resized, and its maximum allowed size, respectively.
+([Firefox bug 1842773](https://bugzil.la/1842773).)
+
+<table>
+  <thead>
+    <tr>
+      <th>Release channel</th>
+      <th>Version added</th>
+      <th>Enabled by default?</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <th>Nightly</th>
+      <td>124</td>
+      <td>No</td>
+    </tr>
+    <tr>
+      <th>Developer Edition</th>
+      <td>124</td>
+      <td>No</td>
+    </tr>
+    <tr>
+      <th>Beta</th>
+      <td>124</td>
+      <td>No</td>
+    </tr>
+    <tr>
+      <th>Release</th>
+      <td>124</td>
+      <td>No</td>
+    </tr>
+    <tr>
+      <th>Preference name</th>
+      <td colspan="2"><code>javascript.options.experimental.arraybuffer_resizable</code></td>
+    </tr>
+  </tbody>
+</table>
+
 ## APIs
 
 ### Graphics: Canvas, WebGL, and WebGPU
diff --git a/files/en-us/mozilla/firefox/releases/124/index.md b/files/en-us/mozilla/firefox/releases/124/index.md
index eaad303b7757857..4d64808d867c9cc 100644
--- a/files/en-us/mozilla/firefox/releases/124/index.md
+++ b/files/en-us/mozilla/firefox/releases/124/index.md
@@ -66,6 +66,20 @@ This article provides information about the changes in Firefox 124 that affect d
 
 These features are newly shipped in Firefox 124 but are disabled by default. To experiment with them, search for the appropriate preference on the `about:config` page and set it to `true`. You can find more such features on the [Experimental features](/en-US/docs/Mozilla/Firefox/Experimental_features) page.
 
+- **Growable `SharedArrayBuffer`:** `javascript.options.experimental.sharedarraybuffer_growable`.
+
+  The {{jsxref("SharedArrayBuffer")}} is now growable using the {{jsxref("SharedArrayBuffer.prototype.grow()")}} method.
+  The maximum allowed size of the buffer is specified using the `options.maxByteLength` parameter to the [`SharedArrayBuffer()` constructor](/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer/SharedArrayBuffer#maxbytelength).
+  The {{jsxref("SharedArrayBuffer.prototype.growable")}} and {{jsxref("SharedArrayBuffer.prototype.maxByteLength")}} properties indicate whether the buffer can be grow, and its maximum allowed size, respectively.
+  ([Firefox bug 1842773](https://bugzil.la/1842773).)
+
+- **Resizable `ArrayBuffer`:** `javascript.options.experimental.arraybuffer_resizable`.
+
+  The {{jsxref("ArrayBuffer")}} can now be resized using the {{jsxref("ArrayBuffer.prototype.resize()")}} method.
+  The maximum allowed size of the buffer is specified using the `options.maxByteLength` parameter to the [`ArrayBuffer()` constructor](/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer/ArrayBuffer#maxbytelength).
+  The {{jsxref("ArrayBuffer.prototype.resizable")}} and {{jsxref("ArrayBuffer.prototype.maxByteLength")}} properties indicate whether the buffer can be resized, and its maximum allowed size, respectively.
+  ([Firefox bug 1842773](https://bugzil.la/1842773).)
+
 ## Older versions
 
 {{Firefox_for_developers(123)}}