storage.managed

A storage.StorageArea object that represents the managed storage area. Items in managed storage are set by the domain administrator or other native applications installed on user's computer, and are read-only for the extension. Trying to modify this storage area results in an error.

The procedure for provisioning managed storage is different for different browsers. For Chrome instructions, see the "Manifest for storage areas" article.

For Firefox, you need to create a JSON manifest file in a specific format, in a specific location. For the details of manifest syntax and location, see Native manifests.

Here's an example manifest:

{
  "name": "favorite-color-examples@mozilla.org",
  "description": "ignored",
  "type": "storage",
  "data":
  {
    "color": "management thinks it should be blue!"
  }
}

Given this manifest, the "favorite-color-examples@mozilla.org" extension could access the data using code like this:

let storageItem = browser.storage.managed.get('color');
storageItem.then((res) => {
  console.log(`Managed color is: ${res.color}`);
});

• favourite-colour