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

The Opera browser has similar functionality:

1. View source code of the page (Ctrl+U).
2. Make some changes. Or paste and replace the entire file.
3. Press Apply Changes in the toolbar (Ctrl+R).

For editing linked resources (such as javascript or CSS files), use the following approach:

1. Open the linked resource in a new tab.
2. View "source code" of the resource (Ctrl+U).
3. Make some changes.
4. Press Apply Changes in the toolbar (Ctrl+R).
5. Return to the tab with the webpage and realod (Ctrl+R).