Bug 1570415 - change the max amount of times the STP doorhanger can be shown from 5 to 2 times; r=johannh

Differential Revision: https://phabricator.services.mozilla.com/D40193

--HG--
extra : moz-landing-system : lando

browser/app/profile/firefox.js

@@ -1909,4 +1909,4 @@ pref("privacy.socialtracking.notification.period.min", 172800000);
 // current number of popup shown in the profile.
 pref("privacy.socialtracking.notification.counter", 0);
 // maximum number of popup shown in the profile.
-pref("privacy.socialtracking.notification.max", 5);
+pref("privacy.socialtracking.notification.max", 2);