How to Add and Remove Accounts Used by Other Apps in Windows 10
In Windows 10, you can define user accounts that will be used by installed Store apps instead of your Microsoft Account you use to sign in to the OS. This can be very useful when you have more than one Microsoft Account. Windows 10 allows defining them in Settings all at once, so you can avoid signing out from individual apps and signing in back with different credentials.
In Windows 10, your user account information is part of the Privacy data which can be controlled with the Settings application. The user can revoke or grant access permissions for apps and users to this data. Recent Windows 10 builds can be configured to allow or deny apps access to their name, picture, and other account info for all your installed apps and the operating system itself. Only if allowed, the OS and installed apps will be able to use your user account information.
There still aren't enough extensions available for Microsoft Edge, which is mostly the company's fault — they took too long to introduce extension support at first and now they seem to be doing a very poor job on attracting developers to bring their products to the Windows Store. But this isn't stopping the company from making their own browser extensions — for third party browsers like Google Chrome.