Firebug

A Firefox extension for debugging operations.

Monitor and tinker with JavaScript, CSS, HTML, and Ajax. Enhance the functionality of Mozilla Firefox with the toolset featuring a debugger, error console, command line, and code inspectors. Automatically check the web-based code line by line and highlight the possible issues.

Pros

Quickly checks any code
Works with multiple languages
Offers editing options

Cons

May fail to integrate with your version of Firefox

Developed by Mozilla Inc.
Latest version: 2.0.19
License: Free
Updated: May 27, 2020

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