Please get rid of ugly intrusive toolbar icon. #2
Description
Showing a toolbar item is way too intrusive for an extension that you hardly ever should need to interact with. Configure & forget.
See ClickToPlugin for how to do it the right way. (Clicking a checkbox to induce an action feels a bit awkward, that how things have to be done in Safari's extensions, apparently.)
For sites that are matched by at least one NinjaKit script add a contextual menu for easily opening its settings.
(somewhat related to issue #1.)