Bug 1069915 - Privacy Panel

This is a new pull regrets for the Privacy Panel. I am very sorry to open another pull request instead of reopening the old one, but before I thought twice I have deleted my mold branch and had to reopen everything from the beginning. 
And I have one more question, is `data-icon` confirmed to use `developer` icon ? it looks kinda weird for privacy panel, but if this is confirmed, I am ok with it.