The StorageArea.getKeys() function (https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/storage/StorageArea/getKeys) allows extension developers an easier way to iterate across the extension storage areas. It's implemented in all other browsers, including Safari, so I hoped it would be easy to port over to Orion as well.
You can test it by installing the Bitwarden extension (or any extension with storage permissions), opening the console, and running await chrome.storage.local.getKeys(). On Gecko, Chromium, and Safari it will return the array of keys, in Orion it will return TypeError: chrome.storage.local.getKeys is not a function
