browser.vpn_promo.enabled is true in tor browser
and it should be set to false.
https://old.reddit.com/r/firefox/comments/13ro31o/mozilla_sends_popup_ad_overlay_in_firefox/jllssx0/
and it should be set to false.
https://old.reddit.com/r/firefox/comments/13ro31o/mozilla_sends_popup_ad_overlay_in_firefox/jllssx0/