[F12] Icons in the Firefox search bar

[Marco Guazzone]

Dear F12 users,

I cannot see any icon in the Firefox search bar when I click for
changing the search engine.
More specifically, in the search bar
* I see the icon of the current search engine
* when I click for changing the search engine, no icon appears in the
list of available search engine.

I'm sure that on F11 (which I have installed until yesterday) I was
able to see those icons.

Any idea?

Thank you very much!!

-- Marco