Go to the Tools menu, select Delete Browsing History, check all boxes (except passwords, if desired) and click Delete
Google Chrome (Win & Mac)
Go to the Settings, select Show advanced settings. Under Privacy, select the Clear browsing data option. Make sure Browsing history is selected. Click Clear browsing data.
Mozilla Firefox (Win & Mac)
Go to the History menu, and select Clear Recent History as shown..
This example is from Firefox version 26.0
Apple Safari (Windows)
Expand the Cog Icon in the upper right corner and select Reset Safari. Check all boxes and click Reset.
Apple Safari (Mac)
Go to the Safari menu, select Reset Safari, check all boxes and click Reset.