First off, I've used NoScript for a number of years and have donated and am hovering between 2-3 stars due to the terrible UI.
Unfortunately the UI remains extremely poor, with confusing wording and very bad icon designs (w.r.t usability, nevermind esthetics). The UI uses double negatives, which is bad (ref: MS and Apple). This may be a side effect of Italian translation.
There is not differentiation with colour: blue and red are used in the icons regardless if something is "safe" or "unsafe". The exclamation mark doesn't work that well for conveying meaning (it's "sort of" a warning, but then the "stop sign" is also used - but now the stop sign means, "stop restricting" (again - double negative))
S!: disable restrictions (change icon. to, almost anything, change wording to: "Allow everything (including blocked scripts)")
!: disable restrictions for this tab (change icon to almost anything else, change wording to: "Allow everything on this tab. (Maintain restrictions on blocked domains)")
Clock!: Set all to temporarily trusted (change icon, "Temporarily Trust everything on this tab. (Maintain restrictions on blocked domains)" )
Clock + Stop symbol: revoke temporary permissions (change icon, wording to "Normal operation"?)