about:config
browser.newtabpage.activity-stream.showSponsored
browser.newtabpage.activity-stream.showSponsoredTopSites
there is also:
services.sync.prefs.sync.browser.newtabpage.activity-stream.showSponsored
services.sync.prefs.sync.browser.newtabpage.activity-stream.showSponsoredTopSites
This has happened before with the browser toolbar having an about:config option to disable enlarging behavior, now you have to do some hacky CSS thing.
> We intend to add a keyboard shortcut for this[1]. In the meantime you can revert to the old printing interface by setting the `print.tab_modal.enabled` preference to `false` via the page `about:config`. In a few releases time, after we've finished integrating user feedback and polishing rough edges, we intend to remove that preference though.
1. Click the "Customize your New Tab page" gear icon on the New Tab page.
2. Uncheck the "Sponsored Top Sites" and "Sponsored Stories" checkboxes.
Say what you want about Safari being outdated etc. but at least they’re not going to pull shit like this.