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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.


  • Quickly checks any code
  • Works with multiple languages
  • Offers editing options


  • 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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