Help modifying Firefox customizable panel

Can someone help me figure out how to modify this customizable panel in Firefox?

Firefox customizable panel

I want to get rid of the "'Sign in to Sync" row...and the "Exit Firefox" button is pretty useless to me as well.

Normally I can load up Dom Inspector and find what I want, but the panel only appears after you click the button, so it makes it impossible (for me) to inspect or make it blink. How do you inspect XUL stuff that only appears after clicking it?

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