browser extension to replace JavaScript file on a live site for testing

Question

I\'m looking for a browser extension (Firefox, Chrome) allowing to replace a Javascript file on a live Web site to do some testing/hacking.

Basically, it should take a U

Answer 1

Alternatives:

• Using chrome you can change code on the fly (Developer tools -> Sources tab) and just save it (command + s)
• Use the LiveReload app that actually attaches an extension (that kind of does what you want) http://livereload.com/

This may not be the "exact" answer to your question, yet I almost sure one of those will do what you want to do.