How to Delete your Browser's History on a MAC. The differences in operating a Mac versus a PC are often quite noticeable, but deleting your browser's history on a Mac is almost identical to deleting your browser's history on a PC.
How to Delete Your Browser's History on a Mac
Open your browser and click "Tools" at the top of the screen.
From the sub-menu, choose "Clear Private Data." Put a check mark next to "Browsing History" in the pop-up menu. Select any other items that you'd like to clear, such as your download history or saved form history.
Deselect any check marks next to any items that you do not wish to clear. Click "Clear."