Secure context
This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The read-only property returns the singleton StorageManager object used to access the overall storage capabilities of the browser for the current site or app. The returned object lets you examine and configure persistence of data stores and learn approximately how much more space your browser has available for local storage use.


var storageManager =;


A StorageManager object you can use to maintain persistence for stored data, as well as to determine roughly how much room there is for data to be stored.


Specification Status Comment
The definition of '' in that specification.
Living Standard Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Microsoft Edge Opera Safari (WebKit)
Basic support 55 51 (51)[1]
57 (57)[2]
? ? 42 ?
Feature Android Webview Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? 55 51.0 (51)[1] ? 42 ?

[1] Firefox 51 introduced NavigatorStorage,, and the StorageManager.estimate() method. These are enabled by default in nightly builds but disabled by default in all other builds. You can enable these features by setting the preference dom.storageManager.enabled to true.

[2] The Storage API is implemented and enabled by default in Firefox 57 Desktop.

See also

Document Tags and Contributors

 Contributors to this page: loomchild, chrisdavidmills, jpmedley, inexorabletash, yisibl, Sheppy
 Last updated by: loomchild,