The most popular web development tool for Firefox
* Inspect HTML and modify style and layout in real-time
* 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.
# Just the way you like it
Firebug is always just a keystroke away, but it never gets in your way. You can open Firebug in a separate window, or as a bar at the bottom of your browser. Firebug also gives you fine-grained control over which websites you want to enable it for.
# Inspect and edit HTML
Firebug makes it simple to find HTML elements buried deep in the page. Once you've found what you're looking for, Firebug gives you a wealth of information, and lets you edit the HTML live.
# Tweak CSS to perfection
Firebug's CSS tabs tell you everything you need to know about the styles in your web pages, and if you don't like what it's telling you, you can make changes and see them take effect instantly.
# Visualize CSS metrics
When your CSS boxes aren't lining up correctly it can be difficult to understand why. Let Firebug be your eyes and it will measure and illustrate all the offsets, margins, borders, padding, and sizes for you.
# Monitor network activity
# Quickly find errors
# Explore the DOM
Changelog for this release:
CSS on in SVG placed in a mixed XHTML+SVG document does not show up on CSS tab
The script panel is taking over Firebug and it shouldn't debugger
Selected script in script window changes when timer changes markup on page
Shortcut customizations are not applied until firebug is loaded
"Deactivate Firebug" is shown even when Firebug is already deactivated
Firebug opens upon first use of Ctrl+Shift+A/J shortcuts
Command + ENTER no longer runs entered command
Display of Style side panel fails for invalid character in string
FB toolbar icon does not get added by default anymore
Break on HTML mutation works only if the HTML panel is selected
HTMLCollection object is undefined in the Script panel
Context menu in select, radio, check, not work
Allow rebind of Help/F1 shortcut key in Firebug's Customize Shortcut dialog