Useful Firefox browser add-ons for web development

Browser extensions are useful tools for developer. It helps them debug, modify or test the webpages with useful options and information. For example, firebug in firefox is a powerful web development tool that allows you to inspect HTML and modify the style. Although one can do it using a browser’s developer tool, firebug has features which effectively executes these tasks.



Listed in Firebug’s website, here are some features it has:

  • Inspect HTML and modify style and layout in real-time
  • Use the most advanced JavaScript debugger available for any browser
  • Accurately analyze network usage and performance
  • Extend Firebug and add features to make Firebug even more powerful
  • Get the information you need to get it done with Firebug



For more info about firebug, visit



Hackbar is a toolbar that will help you test sql injections, XSS holes and site security. Its main purpose is to help the developer do security audits on their code.



  • Even the most complicated urls will be readable
  • The focus will stay on the textarea, so after executing the url (Ctrl+Enter) you can just go on typing / testing
  • The url in textarea is not affected by redirects
  • MD5/SHA1/SHA256 hashing
  • XSS useful functions



– Load URL ( Alt + A )

– Split URL ( Alt + S )

– Execute ( Alt + X, Ctrl + Enter )

– INT -1 ( Alt – )

– INT + 1 (Alt + )

– HEX -1 ( Ctrl Alt – )

– HEX +1 ( Ctrl + Alt + )

– MD5 Hash ( Alt + M )

– MySQL CHAR() ( Alt + Y )

– MY SQL Server CHAR() ( Alt + Q )





You can get Hackbar here.


These add-ons requires firebug to work properly.


YSlow is a tool which analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.


Get YSlow here.