Always at your service
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
- New pref to disable/enable delayed Firebug load
- Can't set error breakpoint for shallow error when "Show Stack Trace with Errors" isn't set
- Style side panel doesn't display CSS rules after reload
- Code completion suggestion popup misbehaves after switching from command line to command editor
- Inline editing of cropped attribute values shows the cropped value
- Firebug triggers Firefox crash on Ubuntu since the fix for issue 5427
- Infotip broken for web fonts defined via data URLs or having a different case than their definition
- Fonts are not displayed inside Style side panel
- Cookies with UTF-8 values let all cookies disappear
- Short tag of element rep treats class=" a" as having a class ""
- Firebug command does not go away when disabled
- Delete "element.style" is broken