To group tabs in the Island Browser, you can follow these steps:

1. Open Island on your computer.

2. Right-click on a tab that you want to group.

3. From the context menu, select "Add to new group."

4. A colored dot will appear next to the tab, indicating that it has been added to a group.

5. To create a new group, right-click on any tab and select "Add to new group" again. You can also drag and drop tabs onto an existing group to add them.

6. To customize the group, right-click on the colored dot and select "Edit group."

7. In the group edit mode, you can change the group name, and color, and even add a group icon.

8. To move tabs between groups, simply drag and drop them onto the desired group.

9. You can also collapse or expand a group by clicking on the colored dot.

10. To remove a tab from a group, right-click on the tab and select "Remove from group."

11. If you want to delete a group entirely, right-click on the colored dot and select "Ungroup."

By following these steps, you can effectively group tabs in Island for better organization and easier navigation.