hello, when you drag a page from the bookmarks into a slot on the new tab page this page will already be pinned in its location - another click on the pin unpins it and subsequently removes it from your new tab page again...

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 and drop them in a tile on the about:newtab page to pin them and have your own favorites sites showing.

Changes made manually on the about:newtab page are stored in the browser.newtabpage.pinned (default = [null]) and browser.newtabpage.blocked prefs that you can check/modify on the about:config page.

If you do not keep changes after a restart then check for problems with preferences, see:

• http://kb.mozillazine.org/Preferences_not_saved