The console panel offers a JavaScript command line, lists all kinds of messages and offers a profiler for JavaScript commands.
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This menu is reachable via the little arrow in the panel tab ( 
| 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 logging of JavaScript error messages into the console |
| Show JavaScript Warnings | extensions.firebug.showJSWarnings | Toggles logging of JavaScript warning messages into the console |
| Show CSS Errors | extensions.firebug.showCSSErrors | Toggles logging of CSS error messages into the console |
| Show XML/HTML Errors | extensions.firebug.showXMLErrors | Toggles logging of XML and HTML error messages into the console |
| Show XMLHttpRequests | extensions.firebug.showXMLHttpRequests | Toggles logging of XMLHttpRequests into the console; see the Net Panel for more info |
| Show Chrome Errors | extensions.firebug.showChromeErrors | Toggles logging of program and add-on internal error messages into the console |
| Show Chrome Messages | extensions.firebug.showChromeMessages | Toggles logging of program and add-on internal messages into the console |
| Show External Errors | extensions.firebug.showExternalErrors | Toggles logging of external error messages into the console |
| Show Network Errors | extensions.firebug.showNetworkErrors | Toggles logging of network error messages into the console |
| Show Stack Trace With Errors | extensions.firebug.service.showStackTrace | Toggles the inclusion of the stack trace for error messages |
| Show Cookie Events | extensions.firebug.cookies.logEvents | Toggles logging of cookie events into the console; see the Cookies Panel for more info |
| Strict Warnings (performance penalty) | javascript.options.strict | Toggles logging of strict warnings into the console |
| Command Editor | extensions.firebug.commandEditor | 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.
As with some of the other panels the console panel offers a "Break On ..." feature. In this case it's "Break On All Errors" ( 
Clears the console by removing all messages from the output.
This option prevents clearing the console when a page is reloaded. Thus all 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.
There are different buttons allowing you to filter the display of messages logged to the console:
| Option | Description |
|---|---|
| All | Displays all messages |
| Errors | Limits the display to error messages |
| Warnings | Limits the display to warning messages |
| Info | Limits the display to info messages |
| Debug Info | Limits the display to debug info messages |
| Cookies | Limits the display to cookie events |
You can also select multiple filters by holding down Ctrl /
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