Options to Restore Tabs on Startup
All tabs are closed when a Chromebook shuts down. Tabs can be restored on startup so you can continue where you left off using one of the two methods below.
Option 1:
Keyboard key combination CTRL + Shift + T will restore tabs individually.
Option 2:
Navigate to Chrome OS Settings by clicking on the time in the bottom right corner.
Click on the Settings icon.
Select System Preferences. Under Startup, you'll see Restore session on startup. From the drop down menu, you can opt to have tabs Always restore or Ask every time. You can also turn this feature Off.