Where to find diagnostic tools
From Joomla! Documentation
The following diagnostic tools may prove useful when developing templates. Note that this guide applies to Joomla! 
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Mozilla Firefox web browser
- Firebug (Firefox 1.5+) (For more information, please watch the free video tutorial on using Firebug with Joomla.)
- Web Developer toolbar (Firefox 1+, Flock, Seamonkey)
- Simple CSS Viewer (Firefox 1.5)
Internet Explorer web browser
- Microsoft Internet Explorer Developer Toolbar (MSIE 7)
- DebugBar (MSIE 5 - 8, free for personal use)
- MSIE 8, press SHIFT+F12 or click the Developer Tools icon in the command bar
- Users of Office XP and later may also install the "Script Debugger" via Office Setup (the debugger is not installed by default)
Opera web browser
Opera has a build in Diagnostic tool called Dragonfly. When viewing the page, right click and choose "Inspect Element" to start Dragonfly.
- Introduction to Opera Dragonfly (Opera 10+)
Safari web browser
- How to enable the Safari 3.x Developer Menu (
) - WebKit Drosera JavaScript Debugger ( WebKit:
)
