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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 URL and load another one instead (locally or on a HTTP development server).
Any idea?
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To execute JavaScript in a browser you have two options — either put it inside a script element anywhere inside an HTML document, or put it inside an external JavaScript file (with a . js extension) and then reference that file inside the HTML document using an empty script element with a src attribute.
A chrome extension is a program that is installed in the Chrome browser that enhances the functionality of the browser. You can build one easily using web technologies like HTML, CSS, and JavaScript.
Use Chrome browser and with the Web Server for Chrome extension, set a default folder and put your linked html/js files in there, browse to 127.0. 0.1:8887 (0r whatever the port is set at) in Chrome and open the developers panel & console. You can then interact with your html/js scripts in the console.
Try http://www.fiddler2.com/fiddler2/version.asp
It does that and much more. But it's not a browser extension.
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