To open the Web Console:
- either select "Web Console" from the Web Developer submenu in the Firefox Menu (or Tools menu if you display the menu bar or are on Mac OS X)
- or press the CtrlShiftK (CommandOptionK on OS X) keyboard shortcut.
The Web Console's interface is split into three horizontal sections:
- Toolbar: along the top is a toolbar containing two buttons. Click the garbage can button to clear the contents of the console. Click the funnel icon to filter the message that are displayed in the console
- Message Display Pane: the messages generated by the code in the page and by the commands entered on the command line are displayed following each command