As a Firefox user, you may have noticed the appearance from several versions of “briefs” on the news of Mozilla and Firefox. If you don't want to see these ads appear, read our article.
To do this, open the menu of Preferences via the icon” hamburger or enter directly into the address bar this:
On the tab Home, at the bottom of the page, uncheck Briefs: News of Mozilla and Firefox.
Changes are immediate, no need to save.
Open a new tab to see the result.