firefox Unresponsive script page busy, ublock origin, script debugger, or dom.max_script_run_time
Type about:config in the address bar and press Enter.
search for the preference dom.max_script_run_time.
“Warning: Unresponsive script”
“A script on this page may be busy, or it may have stopped responding.
You can stop the script now, or you can continue to see if the script will complete.”