Bug 1777198 - Enable dom.abort_script_on_child_shutdown in nightly. r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D151825

modules/libpref/init/StaticPrefList.yaml

@@ -4618,7 +4618,7 @@
 # Controls if a content script will be aborted on child process shutdown.
 - name: dom.abort_script_on_child_shutdown
   type: bool
-  value: false
+  value: @IS_NIGHTLY_BUILD@
   mirror: always
 
 - name: dom.max_chrome_script_run_time