=== MAIN/VIEW start up ===
These are named after the actions passed inside the <code>IntentsIntent</code> s received by the app [https://developer.android.com/reference/android/content/Intent#ACTION_MAIN such as <code>ACTION_MAIN</code>]:
* MAIN = a start up where the app icon was clicked. If there are no existing tabs, the homescreen will be shown. If there are existing tabs, the last selected one will be restored
* VIEW = a start up where a link was clicked. In the default case, a new tab will be opened and the URL will be loaded