jsFiddle is an online editor for developing code snippets build from HTML, CSS and JavaScript and sharing with others. It provides functionality to embed on a blog. Using this approach, JavaScript developers can very easily isolate bugs. It supports inbuilt popular javascript frameworks like jquery, mootools...etc.

Debugging makes dev life easier. See following video to set breakpoint and debug jsFiddle's javascript code using firebug as we do in our local code.

In Script tab of FireBug, You need to select _display file. It has the code written in javascript section of jsFiddle. Just put breakpoint and debug easily.

Enjoy jsFiddle!!!