From today previous solution does not work! "Hi, from Firefox 41, you need to use the add-on New Tab Override (browser.newtab.url replacement), to make changes to the New Tab page. Once installed, open the Add-ons Manager (Ctrl+Shift+A) > Extensions, then look for New Tab Override and click on Options to set your preference. Note, if you only want the New Tab to be the same as your Home page, you can use the add-on New Tab Homepage instead. You may then need to restart Firefox for any changes to take effect. To use Super Start, you can try this: Type about:config into the address bar, press Enter, accept the warning, scroll down to extensions.superstart.set.browser.newtab.url and double click to change 'Value' from False to True, then restart Firefox. If your question is resolved by this or another answer, please take a minute to let us know. Thank you."

If there is no possibility to bring back my SuperStart (where I organized all my bookmarks) or it will happen again and again, actually this is third time and now previous solution does nor work, just tell me, I will start to use another browser. I do not want to waste my time on your useless and annoying NewTabs.