Telemetry console

Firework Embed feed provides aditional telemetry console which can be enabled by executing small javascript code snippet either from url bar or JS console (Command+Option+J).
Recommended way is to create browser Bookmarklet. More about bookmarklets.

Google Chrome guide

Step 1

Click the star next to url in browser's address bar to open bookmark edit modal.
Google Chrome address bar.

Step 2

Click More... to edit bookmark address.
Edit Bookmark modal in Google Chrome.

Step 3

Copy and paste code below to the URL field. Modify name if necessary and save
javascript: (window._fwn ? window._fwn.console() : alert('FWN could not be found.'))
Paste the code into bookmark's URL field.