This guide shows you how to use Chrome DevTools to view and change
data stored by extensions using the chrome.storage API.
View extension storage
Open DevTools for the context you want to inspect.
Navigate to Application > Storage and expand Extension Storage.
Select the storage area you want to inspect:
a. For contexts where multiple extensions may be present, expand the extension you are interested in, and then choose the storage area.
b. In contexts associated with a single extension, you can directly select the storage area.
To preview a value in the preview section, select a row in the table.
To view updated values, click 
Refresh in the action bar at the top.
Availability
Extension storage is accessible when inspecting the following contexts:
- Documents where extensions have injected a content script.
- Documents (including iframes) with the
chrome-extension://scheme. - Extension service workers.
- In MV2, inspecting a background page.
In all cases, the extension will only show in DevTools if the extension has the storage permission.
Access levels
By default, the chrome.storage.session area is not accessible
to content scripts. However, it is always available in DevTools, even when
inspecting a page where the extension is running a content script that does not
have access.
Filter key-value pairs
To quickly find a key-value pair you need, type into the filter box at the top a string that either the key or value contains.
Create a new key-value pair
- Double-click the empty part of the table. DevTools creates a new row and focuses your cursor in the Key column.
- Enter a new key-value pair.
Where possible, DevTools will parse the value you enter as JSON and store the corresponding object. Values which are not valid JSON will be stored as strings.
Edit keys or values
To edit a value, double-click a cell in the Key or Value column to edit that key or value. You may need to reload your extension for it to retrieve the updated values.
Delete key-value pairs
- Click a key-value pair to select it.
- Click
Delete in the action bar at the top to remove the selected pair.
Alternatively, click 
Clear all to remove all pairs.