How to edit the url of sites in new tab page of firefox

I found solution for this problem. 1. Type ''about:config'' in firefox url and click enter. 2. An alert will be shown on click on "I'll be careful, I promise!" button. 3. Type ''browser.newtabpage.pinned'' in textbox and click enter. 4. Right click and select '''Modify''' option to edit the url address. ''I want to change this url address'' [{"url":"http://localhost:8080/Admin/login","title":null},] After change the url address in firefox is [{"url":"http://localhost:8080/Admin","title":"Admin"},]