Last week, I showed you how to delete cookies in Internet Explorer and for Google Chrome.
Now, let’s talk about Firefox. First, tap on the menu icon on the top right, then Options.

In the tab that opens, tap on Privacy on the left, then the blue link that says Clear you recent history.

You’ll see a box pop up in the middle of the screen. Be sure to tap the arrow next to Details to see options for deleting search history.

Just like in Google Chrome, you can change the range of time you want to erase, from the last hour to everything you’ve visited in the box at the top. In the Detail box, uncheck anything you don’t want to delete. If you’re just interested in removing your cookies, uncheck everything except for Cookies. Once again, I’d like to provide a reminder that when you delete all cookies, you may find you’ll have to log in to websites that you were automatically logged into before, and may have to reenter passwords as well. Clearing other saved searches and histories may cause you to have to reenter other data or cause sites to load slower when you first visit them again.
~ Audra
You can get the same results by clicking on the triple bars,choose history,then click on clear recent history.