What is Firebug?
Introduction and Features
Documentation
FAQ and Wiki
Community
Discussion forums and lists
Get Involved
Hack the code, create extensions
Firebug
Web Development Evolved.
Install Firebug
for Firefox, 100% free and open source
Source Firebug Lite Extensions
The most popular and powerful web development tool
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.
More Features »
Introduction to Firebug
Firebug pyroentomologist Rob Campbell gives a quick introduction to Firebug.
Watch now »

More Screencasts »
Inspect
Pinpoint an element in a webpage with ease and precision.
Log
Send messages to the console direct from your webpage through Javascript.
Profile
Measure your Javascript performance in the Console's Profiler.
Debug
Step-by-step interactive debugging in a visual environment.
Analyze
Look at detailed measurements of your site's network activity.
Layout
Tweak and position HTML elements with CSS and the Layout panels.
Recent news
Firebug 1.12 alpha 8
14 June 2013 | 3:09 pm by Honza
getfirebug.com has Firebug 1.12 alpha 8

Firebug 1.12a8 fixes 11 issues
Firebug 1.12a8 is compatible with Firefox 21-24



Some highlights from this release
Multiple filters selectable in the Net panel (issue 4156)
Multiple filters can be set at the same time by holding down Ctrl while clicking the filter buttons.





Multiple filters selectable in the Console panel (issue 4621)
Just like in the Net panel, the Console panel also supports multiple filters being selected at the same time.





Store the result of the last command line evaluation in $_ (issue 6519)
There is a new variable available in the Command Line: $_

This variable stores the result of the previous expression evaluation (compatible with Chrome dev tools).



Please post feedback in the newsgroup, thanks

Jan ‘Honza’ Odvarko



Comment on this entry »
Firebug 1.12 alpha 7
31 May 2013 | 3:23 pm by Honza
getfirebug.com has Firebug 1.12 alpha 7

Firebug 1.12a7 fixes 8 issues
Firebug 1.12a7 is compatible with Firefox 21-24



Some highlights from this release
Group Console Messages (issue 4979)
Console messages are grouped now in case the messages appear multiple times consecutively. This feature can dramatically decrease number of logs and make the entire logging easier!


The number on the right side tells how many logs is grouped in the log.



Create selector groups for Elements side panel (issue 5955)
Multiple selector trials are now shown as foldable groups of elements. These groups persist on page reloads and are dynamically updated when the page changes.





Issue 6447: Improve display of timings in net request infotip (issue 6447)
The tooltip for individual HTTP requests displayed in the Net panel has been improved. It displays all phases of the current request as a little waterfall graph. And so, it’s now a lot easier to understand the timing.





Please post feedback in the newsgroup, thanks

Jan ‘Honza’ Odvarko



Comment on this entry »
Firebug 1.11.4
25 May 2013 | 3:24 am by Honza
Firebug 1.11.4 has been released (archive).

Firebug 1.11.4 fixes 4 issues
Firebug 1.11.4 is compatible with Firefox 17-22


All users subscribed to AMO beta channel should be already updated to version 1.11.4 beta 1 which is exactly the same as 1.11.4.



This version is a follow-up for 1.11.3 and fixes some reported problems. Specifically XHR Spy works again for Firefox 17 and CSS pseudo-element rules are now properly displayed in the Style panel.



Please post feedback in the newsgroup, thanks!

Jan ‘Honza’ Odvarko



Comment on this entry »
Read more blog posts on the Firebug weblog »
Links and Elsewhere

Firebug around the web

Firebug
Home
Downloads
Resources
What is Firebug
Community
Get Involved
Blog

Copyright © 2005-2010 Mozilla. All rights reserved.
Privacy PolicyLegal Notices