The websites that show up on the normal about:tabs page are in the order of the most visited page first. You can lock a site in place using the 'thumbtack' in the upper corner.

You can change the order of the boxes on the about:newtab page and drag an item to a different tile to pin it to that position or you can remove a website by clicking the close X to block that URL. You can drag a bookmark or history item from the sidebar and drop it in a tile on the about:newtab page to pin this item and have your own favorites sites present.

• https://support.mozilla.org/kb/customize-new-tab-page

I see how you can pin it to keep it there, but how do i get youtube in there to pin it, Thanks

You can drag a tab or history item from the sidebar (Ctrl+H) to a tile on the about:newtab page to pin this web page.

I tried a couple of times to drag an drop you tube but it did not work, unless i am doing something wrong?

You can check the browser.newtabpage.blocked pref on the about:config page and if necessary then reset this pref via the right-click context menu to the default value to clear all blocked websites.

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config