Chrome:
On your computer, open Chrome.
In the top toolbar, Click History > Show Full History
Click Clear browsing data on the left side.
At the top, choose a time range. To delete everything, select All time.
Next to "Cookies and other site data", check the box
Click Clear data.
Firefox:
Click the menu button in the top toolbar and select Preferences.
Select the Privacy & Security panel and go to the Cookies and Site Data section.
Select the box next to "Cookies and Site Data"
Click Clear
Safari:
Select Preferences from the Safari menu or hold down the Command key and the comma key at the same time (Command+,).
Go to the Privacy tab.
Click the Remove All Website Data button to remove all stored website data, or skip to step 5 to remove data on a site-by-site basis.
Click Remove Now to confirm.