Clear private data in Firefox
Question: How do I clear my browsing history, download history, cache cookies, saved passwords and authenticated sites in Firefox?
Solution: You can clear all those data by doing the following:
1) Click on ‘Tools’ located at the top menu bar in Firefox.
2) Click on ‘Clear Private Data’ in the drop-down menu.
3) in the small pop-up window, select your options/tick the ones you want to delete and then click on the ‘Clear Private Data Now’ button.