The Deep links settings
The deep links settings panel on the General settings page is where you select whether or not deep links are enabled.
Deep links allow you to link directly to a tab.
If the Enable deep links setting is checked, a tab ID will be added to the end of the URL each time a tab is opened, like this:
When that URL is sent as a link the tab with the matching ID will open automatically.
If the Enable deep links setting is unchecked, tab IDs will not be added to the URL and tabs can not be linked to directly.