This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The dump() method of the WorkerGlobalScope interface allows you to write a message to stdout — i.e. in your terminal, in Firefox only. This is the same as Firefox's window.dump, but for workers.


dump('My message\n');


A DOMString containing the message you want to send.




To write an output from your worker to your computer's terminal, you first have to run an instance of Firefox started from your command line/terminal. For example, on Mac OS X you'd run it using something like this (assuming you are inside the Applications folder):

./ -profile /tmp -no-remote

Now go into about:config and enable the browser.dom.window.dump.enabled pref.

Next, run a worker containing the following line:


This should result in a "test" message being output to the terminal.


This method does not appear in any specification.

Browser compatibility

BCD tables only load in the browser

See also