How to Delete the History on a Mac

Instructions
Safari
Step 1
Click "History" on the toolbar.
Step 2
Scroll to the bottom of the list of history items, and select "Clear History."
Step 3
Select "Clear" in the dialog box.
Firefox
Step 1
Click "Tools" on the menu bar, and select "Clear Recent History."
Step 2
Use the arrows to access the drop-down menu next to "Time range to clear." Choose "Everything" if you would like to delete all of your history, or select a specific time frame to delete.
Step 3
Check the boxes next to the items that you want to delete. If you want to delete all of your browsing history, form and search history, cookies and other information, check all of the boxes.
Step 4
Click "Clear Now."