After I've updated Java to version 7 update 17 it no longer activates 'click-to-play' when I am browsing to a site that uses Java. I really like to put it back to 'click-to-play' list in light of Java security problems coming out weekly.
I know that you can turn on 'click-to-play' globally (for all plugins) through 'plugins.click_to_play' in 'about:config'.
However, I think it's a very blunt instrument.
I tried to find any documentation about 'click-to-play', but looks like it's really well hidden by Mozilla developers.
What I really would like to understand is where is the 'magic' block list of plugins maintained: locally, or on Mozilla web site? If it is local, where is it?