storage

Enables extensions 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. Among other differences, these include:

  • It's asynchronous.
  • Values are scoped to the extension, not to a specific domain (i.e. the same set of key/value pairs are available to all scripts in the background context and content scripts).
  • The values stored can be any JSON-ifiable value, not just String. Among other things, this includes: Array and Object, but only when their contents can be represented as JSON, which does not include DOM nodes. You don't need to convert your values to JSON Strings prior to storing them, but they are represented as JSON internally, thus the requirement that they be JSON-ifiable.
  • Multiple key/value pairs can be set or retrieved in the same API call.

To use this API you need to include the "storage" permission in your manifest.json file.

Each extension 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 the extension code to store extension-related data. Firefox will clear data stored by extensions 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.

You can examine the stored data under the Extension Storage item in the Storage Inspector tab of the developer toolbox, accessible from about:debugging.

Note: The storage area is not encrypted and shouldn't be used for storing confidential user information.

Types

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

Properties

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

storage.sync
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.
storage.local
Represents the local storage area. Items in local storage are local to the machine the extension was installed on.
storage.managed
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.

Events

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

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
StorageArea
Yes
14
45
?
Yes
14
?
?
48
?
?
?
StorageChange
Yes
14
45
?
Yes
14
?
?
48
?
?
?
local
Yes
14
45
The storage API is supported in content scripts from version 48.
?
Yes
14
?
?
48
?
?
?
managed
Yes
79
57
["Platform-specific storage backends, such as Windows registry keys, are not supported.", "Enforcement of extension-provided storage schemas is not supported.", "The onChanged event is not supported."]
?
No
No
?
?
No
?
?
?
onChanged
Yes
14
45
?
Yes
14
?
?
48
?
?
?
sync
Yes
15
53
Before version 79, storage quota limits are not enforced.
?
No
14
Safari does not sync items saved in the sync storage area, i.e. it behaves the same as the local storage area.
?
?
No
?
?
?

Example extensions

Note: 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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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/storage