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 showing.

Changes made manually on the about:newtab page are stored in prefs that you can find on the about:config page.

• browser.newtabpage.pinned stores websites that you have pinned to a tile.
• browser.newtabpage.blocked stores websites that you have removed by clicking the X button in a tile.

You can reset these prefs via the right-click context menu to the default value to undo these choices.

See also:

• New Tab page in Firefox

You can zoom out the about:newtab page to resize the tiles and have more tiles fit on the page.

• View > Zoom > Zoom Out; Ctrl and -
  "Zoom Text Only" shouldn't have a tick

This will affect all elements on the page, so text get smaller as well. Make sure that only one tab with the about:newtab page is open when you change the page zoom.

Toggle the browser.newtab.preload pref to false on the about:config page in case of issues with remembering the page zoom of the about:newtab page.

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

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• New Tab Tools: https://addons.mozilla.org/firefox/addon/new-tab-tools/