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Enables WebExtensions to store and retrieve data, and listen for changes to stored items.

The storage system is based on the Web Storage API, with a few differences.

To use this API you need to include the "storage" permission in your manifest.json file. Each WebExtension has its own storage area, which can be split into different types of storage.

Although this API is similar to Window.localStorage it is recommended that you don't use Window.localStorage in add-on code. Firefox will clear data stored by add-ons using the localStorage API in various scenarios where users clear their browsing history and data for privacy reasons, while data saved using the storage.local API will be correctly persisted in these scenarios.


An object representing a storage area.
An object representing a change to a storage area.


storage has three properties, which represent the different types of available storage area.

Represents the sync storage area. Items in sync storage are synced by the browser, and are available across all instances of that browser that the user is logged into, across different devices.
Represents the local storage area. Items in local storage are local to the machine the extension was installed on.
Represents the managed storage area. Items in managed storage are set by the domain administrator and are read-only for the extension. Trying to modify this namespace results in an error.


Fired when one or more items change in a storage area.

Browser compatibility

ChromeEdgeFirefoxFirefox for AndroidOpera
StorageArea Yes Yes4548 Yes
StorageChange Yes Yes4548 Yes
local Yes Yes45 *48 Yes
managed Yes No57 * No No
onChanged Yes Yes4548 Yes
sync Yes1553 No No

Edge incompatibilities

Promises are not supported in Edge. Use callbacks instead.

Chrome incompatibilities


Example extensions


This API is based on Chromium's chrome.storage API. This documentation is derived from storage.json in the Chromium code.

Microsoft Edge compatibility data is supplied by Microsoft Corporation and is included here under the Creative Commons Attribution 3.0 United States License.

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