Local Storage

• LocalStorage is for storing data on the device and only available on the client-side as it is not transmitted to a server.
  The data persists even when the tab or the whole browser is closed.
  This is used by the Arc-Calc to store all user entered data like favourites, your name, and custom GB names.
  There are modes and addons which might clear or block the storage.
  
• Arc-Calc "forgets" user entered data. Possible reasons
• Incognito or Private Mode
• These modes and similar usually show no error but delete all local data once the tab or browser is closed.
• Addons
• There are addons which e.g. clean up the browsers cache when closed and thus clear the stored data.
• You might need to whitelist the Arc-Calc's URL to prevent this from happening in the Addon causing this.
• Err-LS!
• This error message means that your browser doesn't allow saving of data
  and prevents the Arc-Calc from using it.
• This can be caused by higher than normal security settings.
• Allowing localStorage in your browser
• In the browsers Settings-menu look for Security or Privacy settings.
• Check if you accidentally selected a too strict setting or whitelist the Arc-Calc's URL.
• Some browsers block this functionality together with cookies.
• If you can't solve the issue feel free to contact me!