Console Panel

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The console panel offers a JavaScript command line, lists all kinds of messages and offers a profiler for JavaScript commands.
The console panel offers a JavaScript command line, lists all kinds of messages and offers a profiler for JavaScript commands.
== Options Mini Menu ==
== Options Menu ==
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Revision as of 11:47, 8 June 2011

Console Panel

The console panel offers a JavaScript command line, lists all kinds of messages and offers a profiler for JavaScript commands.


Options Menu

Option Preference Description
Enabled extensions.firebug.console.enableSites Enables the Console Panel
Disabled extensions.firebug.console.enableSites Disables the Console Panel
Show JavaScript Errors extensions.firebug.showJSErrors Toggles JavaScript error message display inside the Console
Show JavaScript Warnings extensions.firebug.showJSWarnings Toggles JavaScript warning message display inside the Console
Show CSS Errors extensions.firebug.showCSSErrors Toggles CSS error message display inside the Console
Show XML Errors extensions.firebug.showXMLErrors Toggles XML error message display inside the Console
Show XMLHttpRequests extensions.firebug.showXMLHttpRequests Toggles XMLHttpRequest display inside the Console
Show Chrome Errors extensions.firebug.showChromeErrors Toggles program and add-on internal error message display inside the Console
Show Chrome Messages extensions.firebug.showChromeMessages Toggles program and add-on internal message display inside the Console
Show External Errors extensions.firebug.showExternalErrors Toggles external error message display inside the Console
Show Network Errors extensions.firebug.showNetworkErrors Toggles network error message display inside the Console
Show Stack Trace With Errors extensions.firebug.service.showStackTrace Toggles the inclusion of the stack trace for error messages
Strict Warnings (performance panelty) javascript.options.strict.debug Toggles strict warnings display inside the Console
Command Editor extensions.firebug.largeCommandLine Toggles between the Command Line and the Command Editor
Show Completion List Popup extensions.firebug.commandLineShowCompleterPopup Toggles the auto-completion of commands while typing

For more info about tweaks available in Firebug please see the full list of preferences.

Panel Toolbar

Break On All Errors

As some of the other panels the console panel offers a "Break On..." feature. In this case it's "Break On All Errors", which means, that as soon as an error occurs the script execution is stopped.


Clears the console by removing all messages from the output.


The "Persist" option prevents clearing the console at a page reload. That means, the messages will stay inside the console as long as this option is enabled.


Enabling this option lets you profile JavaScript activity. For more info about this feature see the Profiling section.

Command Line

The Command Line is simply used for executing JavaScript commands, but is designed to support people writing code and inspecting objects. For this reason it offers several functionalities, which are described below.


To support the user analysing elements and writing code the command line integrates an auto-completion for the commands you are typing. Therefore after starting to type a command you simply have to press tab and Firebug is completing the command. If there are several commands starting with the same phrase like "getElem" then pressing tab several times alphabetically switches through all available commands. Thereby also the global variables, which you defined in your script, are used.

Command Editor

The Command Editor offers you a bigger text field for entering JavaScript commands consisting of several lines. It has an integrated menu for running the command(s), clearing the text field and copying the contents to the clipboard.

Smart paste

If you are pasting code into the command line, that consists of several lines, the command editor is automatically opened to keep the line breaks.

Clipboard functionality

The entered script can be copied as bookmarklet via the menu of the command editor.

Shortcuts for inspected elements

The command line and the command editor offer you the possibility to easily access elements inside the DOM similar to the sizzle selector library integrated in the jQuery Framework. For a detailed description of the available commands see the Command Line API.

Inspect object in other panel

How you inspect elements using the console is described above. Besides that it's also possible to inspect them in the most appropriate panel by hitting Shift+Enter instead of just Enter.


The console offers three different functionalities. It is showing all messages Firefox' error console is showing. Furthermore it is displaying the results of the commands you entered into the command line. Last but not least it has an integrated profiler for JavaScript activities. For a detailed description of console commands see the Console API.

Message types

The console knows four different types of messages, which are described below:

Type Command Description
Error console.error(object[, object, ...]) Error messages occurring in JavaScript, CSS, XML, chrome, network and stack trace
Warning console.warn(object[, object, ...]) Warnings occurring in JavaScript and CSS
Info[, object, ...]) Informative messages
Debug console.debug(object[, object, ...]) Debugging messages

See also the Console API for more information about the different commands.

Click functionality

Console messages offer you different kinds of options you can access via the mouse buttons resp. the mouse wheel. E. g. clicking on the links in an error message or warning jumps directly to the appropriate panel. Right clicking on them gives you the possibility to copy the message to the clipboard or set a breakpoint for the specific error or all errors. XML HTTP requests thereby let you copy the location or response body via the context menu. Clicking on them shows you detailed information about the request. And middle-clicking opens the requested URL in a new tab.


The console also offers the functionality to profile JavaScript activity via a button in the panel menu. Pressing it once starts the profiler and clicking it again stops profiling. All JavaScript commands, that were executed while the profiler was active, will be listed including detailed statistics about the calls.

See also

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