BUG 1448932 - Added: Prefs for tracking protection intro r=johannh

replaced MAX_INTROS constant value of 20 with pref set to 5

Differential Revision: https://phabricator.services.mozilla.com/D24783

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

browser/app/profile/firefox.js

@@ -1603,6 +1603,8 @@ pref("browser.contentblocking.reportBreakage.url", "https://tracking-protection-
 
 pref("browser.contentblocking.introCount", 0);
 
+pref("browser.contentblocking.maxIntroCount", 5);
+
 pref("privacy.trackingprotection.introURL", "https://www.mozilla.org/%LOCALE%/firefox/%VERSION%/content-blocking/start/");
 
 // Always enable newtab segregation using containers

browser/base/content/browser-contentblocking.js

@@ -745,7 +745,7 @@ var ThirdPartyCookies = {
 
 var ContentBlocking = {
   // If the user ignores the doorhanger, we stop showing it after some time.
-  MAX_INTROS: 20,
+  MAX_INTROS: Services.prefs.getIntPref("browser.contentblocking.maxIntroCount"),
   PREF_ANIMATIONS_ENABLED: "toolkit.cosmeticAnimations.enabled",
   PREF_REPORT_BREAKAGE_ENABLED: "browser.contentblocking.reportBreakage.enabled",
   PREF_REPORT_BREAKAGE_URL: "browser.contentblocking.reportBreakage.url",

browser/tools/mozscreenshots/mozscreenshots/extension/configurations/ControlCenter.jsm

@@ -28,7 +28,7 @@ const TRACKING_PAGE = `http://tracking.example.org/${RESOURCE_PATH}/tracking.htm
 var ControlCenter = {
   init(libDir) {
     // Disable the FTU tours.
-    Services.prefs.setIntPref("browser.contentblocking.introCount", 20);
+    Services.prefs.setIntPref("browser.contentblocking.introCount", 5);
   },
 
   configurations: {