You can check this article *https://support.mozilla.org/en-US/kb/recover-user-data-missing-after-firefox-update Changes made on the Firefox Home page are stored in prefs you can find in <b>about:config</b>. *browser.newtabpage.blocked => websites removed by clicking Dismiss in a tile *browser.newtabpage.pinned => websites pinned to a tile The pinned pref is part of prefs than can be synced as set via this control pref. *services.sync.prefs.sync.browser.newtabpage.pinned *https://support.mozilla.org/en-US/kb/about-config-editor-firefox You can backup the pinned pref to be able to restore your pinned tiles.