Bug 1632098 - P3. Enable the ParentProcessDocumentChannel. r=mattwoodrow

Differential Revision: https://phabricator.services.mozilla.com/D72297

modules/libpref/init/StaticPrefList.yaml

@@ -986,7 +986,7 @@
 
 - name: browser.tabs.documentchannel.ppdc
   type: bool
-  value: false
+  value: true
   mirror: always
 
 - name: browser.tabs.remote.desktopbehavior