storage.session quota enforcement

files/en-us/mozilla/add-ons/webextensions/api/storage/session/index.md

@@ -14,6 +14,11 @@ The amount of data that an extension can store in the session storage area is li
 
 When the browser stops, all session storage is cleared. When the extension is uninstalled, its associated session storage is cleared.
 
+## Properties
+
+- {{WebExtAPIRef("storage.session.QUOTA_BYTES")}}
+  - : The maximum amount of data (in bytes) that can be stored in session storage.
+
 ## Methods
 
 The `session` object implements the methods defined on the {{WebExtAPIRef("storage.StorageArea")}} type:

files/en-us/mozilla/add-ons/webextensions/api/storage/session/quota_bytes/index.md

@@ -0,0 +1,18 @@
+---
+title: storage.session.QUOTA_BYTES
+slug: Mozilla/Add-ons/WebExtensions/API/storage/session/QUOTA_BYTES
+page-type: webextension-api-property
+browser-compat: webextensions.api.storage.session.QUOTA_BYTES
+---
+
+{{AddonSidebar}}
+
+The maximum amount of data (in bytes) that can be stored in session storage. Use {{WebExtAPIRef("storage.StorageArea.getBytesInUse()", "storage.session.getBytesInUse()")}} to determine the amount of stored data.
+
+Its value is `10485760`.
+
+{{WebExtExamples("h2")}}
+
+## Browser compatibility
+
+{{Compat}}

files/en-us/mozilla/add-ons/webextensions/api/storage/storagearea/clear/index.md

@@ -17,7 +17,7 @@ This is an asynchronous function that returns a [`Promise`](/en-US/docs/Web/Java
 let clearing = browser.storage.<storageType>.clear()
 ```
 
-`<storageType>` is one of the writable storage types — {{WebExtAPIRef("storage.local")}}, {{WebExtAPIRef("storage.session")}}, or {{WebExtAPIRef("storage.sync")}}
+Where `<storageType>` is one of the writable storage types — {{WebExtAPIRef("storage.local")}}, {{WebExtAPIRef("storage.session")}}, or {{WebExtAPIRef("storage.sync")}}
 
 ### Parameters
 

files/en-us/mozilla/add-ons/webextensions/api/storage/storagearea/get/index.md

@@ -19,7 +19,7 @@ let results = browser.storage.<storageType>.get(
 )
 ```
 
-`<storageType>` will be one of the writable storage types — {{WebExtAPIRef("storage.sync", "sync")}}, {{WebExtAPIRef("storage.local", "local")}}, or {{WebExtAPIRef("storage.managed", "managed")}}.
+Where `<storageType>` is one of the storage types — {{WebExtAPIRef("storage.sync", "sync")}}, {{WebExtAPIRef("storage.local", "local")}}, {{WebExtAPIRef("storage.session", "session")}}, or {{WebExtAPIRef("storage.managed", "managed")}}.
 
 ### Parameters
 

files/en-us/mozilla/add-ons/webextensions/api/storage/storagearea/getbytesinuse/index.md

@@ -7,13 +7,12 @@ browser-compat: webextensions.api.storage.StorageArea.getBytesInUse
 
 {{AddonSidebar}}
 
-Gets the amount of storage space, in bytes, used one or more items being stored in the storage area.
+Gets the amount of storage space, in bytes, used by one or more items stored in the storage area.
 
-This function only exists in browser.storage.sync
-It does not exist in browser.storage.local
-See <https://bugzil.la/1385832>
+> [!NOTE]
+> Firefox only provided support in {{WebExtAPIRef("storage.session")}} from Firefox 131. Firefox doesn't provide this method in {{WebExtAPIRef("storage.sync")}}, see [Firefox bug 1385832](https://bugzil.la/1385832). Firefox doesn't provide this method in {{WebExtAPIRef("storage.managed")}}.
 
-This is an asynchronous function that returns a [`Promise`](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise).
+This is an asynchronous method that returns a [`Promise`](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise).
 
 ## Syntax
 
@@ -23,16 +22,18 @@ let gettingSpace = browser.storage.<storageType>.getBytesInUse(
 )
 ```
 
-`<storageType>` can only be {{WebExtAPIRef("storage.sync")}}, not {{WebExtAPIRef("storage.local")}} because of [this bug](https://bugzil.la/1385832).
+Where `<storageType>` is one of the storage types — {{WebExtAPIRef("storage.sync", "sync")}}, {{WebExtAPIRef("storage.local", "local")}}, {{WebExtAPIRef("storage.session", "session")}}, or {{WebExtAPIRef("storage.managed", "managed")}}.
+
+In Firefox, `<storageType>` can't be {{WebExtAPIRef("storage.local")}}, because of [bug 1385832](https://bugzil.la/1385832).
 
 ### Parameters
 
 - `keys`
-  - : A key (string) or keys (an array of strings) to identify the item(s) whose storage space you want to retrieve. If an empty array is passed in, 0 will be returned. If you pass `null` or `undefined` here, the function will return the space used by the entire storage area.
+  - : A key (string) or keys (an array of strings) to identify the items whose storage space you want to retrieve. If an empty array is passed in, 0 is returned. If you pass `null` or `undefined`, the function returns the space used by the entire storage area.
 
 ### Return value
 
-A [`Promise`](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) that will be fulfilled with an integer, `bytesUsed`, representing the storage space used by the objects that were specified in `keys`. If the operation failed, the promise will be rejected with an error message.
+A [`Promise`](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) that is fulfilled with an integer, `bytesUsed`, representing the storage space used by the objects specified in `keys`. If the operation fails, the promise is rejected with an error message.
 
 ## Browser compatibility
 

files/en-us/mozilla/add-ons/webextensions/api/storage/storagearea/remove/index.md

@@ -19,7 +19,7 @@ let removingItem = browser.storage.<storageType>.remove(
 )
 ```
 
-`<storageType>` is one of the writable storage types — {{WebExtAPIRef("storage.local")}}, {{WebExtAPIRef("storage.session")}}, or {{WebExtAPIRef("storage.sync")}}.
+Where `<storageType>` is one of the writable storage types — {{WebExtAPIRef("storage.local")}}, {{WebExtAPIRef("storage.session")}}, or {{WebExtAPIRef("storage.sync")}}.
 
 ### Parameters
 

files/en-us/mozilla/add-ons/webextensions/api/storage/storagearea/set/index.md

@@ -23,7 +23,7 @@ let settingItem = browser.storage.<storageType>.set(
 )
 ```
 
-`<storageType>` is one of the writable storage types — {{WebExtAPIRef("storage.local")}}, {{WebExtAPIRef("storage.session")}}, or {{WebExtAPIRef("storage.sync")}}.
+Where `<storageType>` is one of the writable storage types — {{WebExtAPIRef("storage.local")}}, {{WebExtAPIRef("storage.session")}}, or {{WebExtAPIRef("storage.sync")}}.
 
 ### Parameters
 

files/en-us/mozilla/add-ons/webextensions/api/storage/storagearea/setaccesslevel/index.md

@@ -23,7 +23,7 @@ await browser.storage.<storageType>.setAccessLevel(
 )
 ```
 
-`<storageType>` can be the {{WebExtAPIRef("storage.session")}} storage type.
+Where `<storageType>` is the {{WebExtAPIRef("storage.session")}} storage type.
 
 ### Parameters
 

files/en-us/mozilla/firefox/releases/131/index.md

@@ -66,6 +66,8 @@ This article provides information about the changes in Firefox 131 that affect d
 
 ## Changes for add-on developers
 
+- The 10 MB quota for data stored by the {{WebExtAPIRef("storage.session")}} API is now enforced in Firefox Nightly 131. Previously, Firefox didn't implement this quota. This enforcement rolls out to release versions of Firefox from version 134 ([Firefox bug 1915688](https://bugzil.la/1915688)). This enables extensions that rely on the previous behavior to correct any issues. ([Firefox bug 1908925](https://bugzil.la/1908925))
+- {{WebExtAPIRef("storage.session")}} now supports the {{WebExtAPIRef("storage.StorageArea.getBytesInUse()")}} API and the {{WebExtAPIRef("storage.session.QUOTA_BYTES")}} property. ([Firefox bug 1908925](https://bugzil.la/1908925))
 - {{WebExtAPIRef("tabs.onUpdated")}} is now triggered when `openerTabId` is changed through `tabs.update()` ([Firefox bug 1409262](https://bugzil.la/1409262)).
 - {{WebExtAPIRef("tabs.update")}} now accepts `openerTabId` set to `-1` to clear `openerTabId` ([Firefox bug 1409262](https://bugzil.la/1409262)).