Adding more shortcuts per line to home page

Hello Is it, your question If you wish to test the preference, browser.newtabpage.activity-stream.topSitesRows 1 - Go to configuration editor https://support.mozilla.org/en-US/kb/about-config-editor-firefox 2 - Enter a search term '''browser.newtabpage.activity-stream.topSitesRows''' Clarification, if during your test, you can no longer add a shortcuts, then. Delete the last shortcut added, to be able to recover, add shortcut. To complement, for information, a test with userContent.css https://connect.mozilla.org/t5/ideas/firefox-home-screen-shortcuts-more-rows-please/idc-p/104075/highlight/true#M54807