In the 'History' tab, select 'Clear Recent History':
Make sure that 'Cookies', 'Cache', 'Active Logins', and 'Offline Website Data' are selected:
Then in the Firefox main menu, select 'Preferences':
Select the 'Privacy & Security' tab on the left and then scroll down to find the 'Cookies and Site Data' section. In this section select the 'Clear Data...' button.
This will open a new 'Clear Data' window, select 'Cookies and Site Data' and 'Cached Web Content'. After selecting click the 'Clear' button in the bottom right to kick off this action.
In the Chrome main menu, select ' Clear Browsing Data'. Make sure that 'Cached Images and Files', 'Cookies and Other Site Data', and 'Autofill Form Data' are selected:
You can also get there by going in the Chrome main menu, and by selecting 'Preferences':
Select 'Advanced' to drop-down the below menu. Select 'Privacy and Security':
Select 'Clear Browsing Data':
***Don't forget to restart your browser after you clear your cache!***