You can use keyboard shortcuts to navigate the results (as opposed to the mouse).

Open results:

• Enter or l or o — go to the highlighted result, or use it right away to go to the first result
• Ctrl/Cmd+Enter — open a result in the background
• d — domain search (if a result is highlighted)
• ' or v — open the highlighted result in a new window/tab. Since this uses JavaScript, you need to turn off pop-up blockers first.

Move around:

• ← and → — navigate Instant Answer tabs. When an Instant Answer is open, navigate within the Instant Answer.
• ↓ or j — next search result
• ↑ or k — previous search result
• / or h — go to search box
• s — go to misspelling link (if any)
• t — go to top
• m — go to main results

If you don't like the keyboard shortcuts, you can turn them off in the settings.