I have a .js file and I want to use it on some webpage (I am not developing this script for website, I just want to use my script on company's webpage). Look, it works like an extension very well, but I am looking for a way to launch my .js in browser console. Is it even possible to do this? I tried (intuitively) to import my file through Developer Tools – Sources – Filesystem and use it, but it's not working. Debugger is cursing, and the script is not working. Or it should be working and webpage has some kind of 'anti-cheat'? P.S.: No, I can't just copy-paste the code into the console.