Wšykne wótegrona (2)
If you provide more details about the context of the question, it can help to resolve the issue.
You might be reading the wrong browser instructions. Wrench icon is a prominent part of Google Chrome and Chromium browsers interface, please see the screen-shot.
Is that what you were looking for?
That is not a standard part of Firefox, it was probably part of an extension that was added to Firefox.