Rated 4 out of 5 stars

Great to see that it finally supports FF4, but where do I find the Greasefire icon now?

This review is for a previous version of the add-on (  This user has a previous review of this add-on.

Same place as before

Greasefire simply adds fire to the background of the GM/Scriptish logo within their toolbar button, so you need to be using the toolbar button.