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In mozapps > plugins > pluginProblem.css, you mixed up the blocked icon and the click-to-play icon and used the wrong images.
The blocked should be:
:-moz-handler-blocked .icon,
:-moz-handler-vulnerable-updatable .icon,
:-moz-handler-vulnerable-no-update .icon {
background-image: url("chrome://mozapps/skin/plugins/contentPluginBlocked.png");
-moz-user-focus: normal;

Это отзыв для предыдущей версии этого дополнения (0.1). 

I mostly just copied that over.
Thanks for the information, though - I'm going to fix it, along with the picture to the left of the tabs, which has the old blue tint (notice that?).
Expect a new version..next week I suppose.