Chrome extension to modify page's script includes and JS

Question

I work on a javascript library that customers include on their site to embed a UI widget. I want a way to test dev versions of the library live on the customer\'s site with

Answer 1

It's not a Chrome extension, but Fiddler can change the script to point to your development server (see this answer for setup instructions from the author of Fiddler). Also, with Fiddler you can setup a search and replace to add that extra parameter that you need.