User blog comment:LOL741/Stick Ranger Google Chrome Issue/@comment-1917722-20160802174227

The 'uncaught security error' Chrome complains about is not unheard of and I think a number of people have run into it in the beginning days of modding the game. Unfortunately, Chrome is being a brat and probably can't be convinced into allowing you to run the modded .js file.

IE is indeed a little bumpy at times - I don't suppose you have Windows 10 and Microsoft's new browser Edge? Doesn't always run smoothly and is honestly little better than IE either way, but that might have been a thing. Assuming you don't have it, your only other option would be to download a different browser and run it all on that; Firefox runs it pretty well as far as I've experienced. Firefox isn't a massive program, fortunately, though I could imagine having 3 browsers might be a little annoying.

I hope this helps you in your modding adventures.