Firebug Dynamic Execution of JavaScript

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You can use Firebug to write and execute JavaScript in real-time.

This is useful for testing and ensuring that the script works correctly, which is a good method before deploying JavaScript code into a production environment.

Open Firebug > Script > Show Command Line, the code looks like this:

alert("w3cschool.cc")

After pressing Enter, you will immediately see the output of the code, as shown in the figure: