Web Console UI Tour

The Web Console’s interface is split into three horizontal sections, detailed in the sections below.

Web console" alt="Screenshot of FF web console

Toolbar

The toolbar across the top contains a number of features:

  • Garbage can: Click this icon to clear the contents of the console.

  • Funnel (filter): Enter text to filter the messages that are displayed in the console message pane. Plain-text and regular expression filtering are supported.

  • Filter categories: Toggle a filter category (such as Errors, Warnings, CSS, or XHR) to display messages of that type in the message page (the UI shows the number of hidden message for unselected categories).

  • Settings (ā€œgearā€ menu): Select the gear icon to access the settings menu, where you can toggle the following features on and off:

    • Persist Logs: When enabled, the console doesn’t clear on page reload, or new page load.

    • Show Timestamps: When enabled, timestamps are shown on the left-hand side of each message row to say when the messages were logged.

    • Group Similar Messages: When enabled, similar types of messages are grouped together, with an indicator of the number of occurrences.

    • Enable Autocompletion: When enabled, the JavaScript interpreter attempts to autocomplete while you type.

    • Instant Evaluation: When enabled, the interpreter displays the evaluated results of an expression, when possible, before you press Enter to submit it.

Message display pane

This is where the messages appear, both those generated by the code in the page, and those generated by the commands entered on the command line.

See Console messages for a lot more detail on what the messages can contain.

Note

You can clear the contents of the console by entering the keyboard command Ctrl + Shift + L (Windows, macOS, and Linux) or Cmd + K on macOS.

Command line

The command line starts with double angle brackets (>>). Use it to enter JavaScript expressions.

Clicking on the ā€œsplit paneā€ icon on the right hand side of the command line will open the console multi-line mode.