Recently, there are more and more different Firebug add-ons. I decided to make a short description for these plugins. Only 4 plugins have been described here . I will try to describe all known plugins for Firebug. Article in Ukrainian 1. Firescope - shows the level of support for HTML elements in a particular browser. Documentation 2. Inline Code Finder - searches and displays HTML elements with javascript links (<a href = "javascript:"), inline styles () and inline events (<img onclick = "alert ('1')"). Documentation 3. FireCookie - plugin for managing cookies. Documentation 4. Jiffy adds a panel to display Javascript runtime. Documentation 5. Pixel Perfet - a plugin for imposing a page layout on an HTML page (useful for web designers). Documentation 6. Yslow - analyzes the web page and shows problem areas when loading the page. Documentation 7. Firebug Net Panel History Overlay - Adds a history panel in Firebug. Documentation 8. Rainbow for Firebug - Plugin for syntax highlighting of Javascript. Documentation (If using Firebug 1.2) FireRainbow - for version 1.3 Documentation 9. Firebug Paint Events - shows details for MozAfterPaint events. Documentation 10. FirebugCodeCoverage - shows additional information about Javascript files (list of called functions, file load time, etc.) 11. FirePHP - plugin for PHP integration with the Firebug debugger. Documentation 12. Firesymfony is a debugging plugin for the popular Symfony PHP framework. Documentation 13. Drupal For Firebug - to display debug information from Drupal. Documentation 14. FirePython - debugging Python applications. Documentation 15. UIMap - plugin allows you to generate and test Xpath paths, generate xml from table elements, etc. 16. LogDigger - plugin for Java developers. Allows you to view messages generated by the web application to the client request. Documentation 17. FireSpider - looks for broken links on the page, and also helps to optimize for the SEO page. Documentation 18. SenSEO is a plugin that shows how your page meets important SEO criteria. Documentation 19. ZK Jet - plugin for developing Ajax-applications without installing a server. Documentation 20. QuickFill is a plugin that allows you to easily select text on a page and paste it into the sidebar for further processing. 21. XRefresh . Documentation