Chrome extension storage permission

It lets an extension save and retrieve its own data, such as settings or a saved list, locally on your device or synced across your signed-in browsers, without accessing your browsing activity.

Chrome treats storage as low risk because it only lets the extension manage its own private data. It cannot read website content, cookies or history through this permission.

Yes. It is one of the safest permissions an extension can request, since it is limited to the extension's own saved data rather than anything on the websites you visit.

The storage permission covers data the extension saves for itself, such as settings. The cookies permission covers cookies set by websites, which is a separate and more sensitive category of data.

Yes. Data saved with chrome.storage.sync is synced across browsers where you are signed into the same Google account, up to Chrome's storage size limits for synced data.

Not directly. Storage alone only lets an extension save its own data; it does not grant access to your browsing history, open tabs or website content needed to track activity.

Most extensions have some setting, preference or saved state, such as a theme choice or list of items, and the storage permission is the standard way to persist that data.

Generally no. An extension that requests only storage, with no host or sensitive permissions, has a limited ability to affect your browsing beyond its own interface.

Removing an extension typically deletes its locally stored data. Data synced through chrome.storage.sync may be removed from sync as well, though behavior can vary by extension.

Yes, in most cases. If an extension has an options or settings page that remembers your choices between sessions, it needs the storage permission to save those choices.

Chromium-based browsers like Edge and Brave support the same chrome.storage API, so the storage permission behaves the same way across these browsers.