AdBlock for Chrome can be used to block JS files.....
https://chrome.google.com/webstore/detail/gighmmpiobklfepjocnamgkkbiglidom
...Click on the AdBlock icon and select "Show the resource list" and look for the JS you want to block and tick the box next to it and make your selections.
Note
In settings, "I'm an advanced user, show me advanced options." should be selected.
