Bug 1695050 - Part 1: Add a pref for controlling the cookieBehavior for Private Brwosing Mode. r=dimi,droeh

Differential Revision: https://phabricator.services.mozilla.com/D109044

browser/app/profile/firefox.js

@@ -1694,9 +1694,11 @@ pref("media.gmp-provider.enabled", true);
 #ifdef NIGHTLY_BUILD
 // Enable Dynamic First-Party Isolation in Nightly.
 pref("network.cookie.cookieBehavior", 5 /* BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN */);
+pref("network.cookie.cookieBehavior.pbmode", 5 /* BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN */);
 #else
 // Enable blocking access to storage from tracking resources by default.
 pref("network.cookie.cookieBehavior", 4 /* BEHAVIOR_REJECT_TRACKER */);
+pref("network.cookie.cookieBehavior.pbmode", 4 /* BEHAVIOR_REJECT_TRACKER */);
 #endif
 
 // Enable fingerprinting blocking by default for all channels, only on desktop.

mobile/android/app/mobile.js

@@ -102,6 +102,9 @@ pref("network.predictor.preserve", 50); // percentage of predictor data to keep
 // Use JS mDNS as a fallback
 pref("network.mdns.use_js_fallback", false);
 
+// CookieBehavior setting for the private browsing.
+pref("network.cookie.cookieBehavior.pbmode", 4);
+
 /* How many times should have passed before the remote tabs list is refreshed */
 pref("browser.display.remotetabs.timeout", 10);
 

modules/libpref/init/StaticPrefList.yaml

@@ -8458,6 +8458,12 @@
   value: false
   mirror: always
 
+# The cookieBehavior to be used in Private Browsing mode.
+- name: network.cookie.cookieBehavior.pbmode
+  type: RelaxedAtomicInt32
+  value: 0 # accept all cookies
+  mirror: always
+
 # Stale threshold for cookies in seconds.
 - name: network.cookie.staleThreshold
   type: uint32_t