Suggestion: change icon depending on status (Enabled or not)

[sebdotv]

First, thanks for this amazing extension - it almost makes CSP development fun!

I got caught a time or 2 thinking I was using server CSP when actually the extension was still Enabled and overriding the CSP. It would be helpful if the icon was different when enabled or disabled, e.g. grayed out when disabled, much like another great extension, Proxy SwitchySharp.