Sometimes I want to go back to the last page I viewed while still keeping the same one open. You can very easily achieve this with shortcuts

1. ⌘-L to focus the omnibox
2. ⌘-Enter to open the current URL in a new tab
3. ⌘-⇧-[ to go back to the original tab
4. ⌘-[ to go back to the previously viewed page in the original tab