In your Script saveUCJS.uc.js
line 23 should be now:
var fu = ChromeUtils.importESModule('resource://gre/modules/FileUtils.sys.mjs');
or similar. Here it works in Firefox 125 and above.
the file: FileUtils.jsm not exist any more in Firefox.
All .jsm files have been removed or renamed to sys.mjs.
There no .jsm File left in Firefox.
Hi benzBrake
In your Script saveUCJS.uc.js line 23 should be now: var fu = ChromeUtils.importESModule('resource://gre/modules/FileUtils.sys.mjs'); or similar. Here it works in Firefox 125 and above.
the file: FileUtils.jsm not exist any more in Firefox. All .jsm files have been removed or renamed to sys.mjs. There no .jsm File left in Firefox.
Kind Regards Endor