Because the person responsible (not knowing who that is just yet) directly stole their images, violated their copyright and their intellectual property. Instead of tying things up with lawyers, mediation and strongly worded letters, why not simply pay what was quoted for, and forget it ever happened?
When you talk about lawyers and strongly worded letters, are you talking about MetaLab suing Mozilla over copyright issues, or are you talking about Mozilla suing MetaLab for trying to damage their reputation? And what about Daniel? Doesn't he have a reasonable expectation to privacy? I'm assuming he didn't give MetaLab permission to post his private correspondence with them on their website.
