You can't as that is how that shortcut section on the Firefox Home page works. You can possibly block websites, but those pages are stored in the browser.newtabpage.blocked pref on the <b>about:config</b> page and stored in prefs.js and this file isn't suited to store a large amount of data. See also: *https://support.mozilla.org/en-US/kb/customize-new-tab-page *https://support.mozilla.org/en-US/kb/hide-or-display-content-new-tab