Storage
Reading
If storage is activated, the entered recipient will be searched in the storage. The configuration on this page refers only to individually entered recipients - to configure the behaviour while replying to any mail or editing a draft check the 'Selection' tab.
After entering a new recipient and leaving the address field all results found in storage will be added to the identity dropdown menu.[1]
If you already changed your identity into an virtual identity, it can be assumed that you had done this for purpose. Therefore the extension will ask before replacing your virtual identity [on by default]
To prevent getting asked again and again for every recipient, storage can be ignored after the first identity was successfully retrieved from your storage. This will work fine if you are using the same identity for any possible group of recipients you are using. It is [on by default].
[1] to understand what's happening while searching the storage it is useful to activate the debug output (see last tab).