Since I am expected to spend more than half my packaging time updating the debian/copyright file, I am hereby orphaning nspr, nss, iceape and xulrunner. I am also stopping work on webkit and iceweasel, but they don't end up in the orphan state since they are comaintained.
Good luck to my fellow developpers. (And sorry, sincerely)
Update: As I do realize writing while being pissed doesn't help making the motives right, and apparently, some people have seen this as an extortion, let me make things clearer:
I was starting to work on xulrunner 1.9.1 when the discussion about the copyright files came up. It will require a significant amount of time, and while Noah Slater's opinion alone wouldn't really have carried me that far, despite me saying so because I got pissed by his words, 2 messages from Jörg Jaspert (the only ones he posted so far in the thread, by the way) did make it clear that my work on xulrunner 1.9.1 was going to be a waste of time, which I already lack to properly handle the bugs in my maintained packages, let alone keeping the copyright file up-to-date.
As I am obviously unable to handle the amount of work required to maintain big packages, as drawing new blood in the mozilla team has always failed so far, I just prefer to stop than to over-overflow. Call it extortion to get people in the mozilla team if you want, I'm fine with the notion.
I've been thinking to stop working on big packages for nearly a year already, but never mentionned it but to a few people in a few occasions. I couldn't resolve myself to do it, though I did reduce the amount of time I spend on these packages (I was overflown, a year ago). I just found an excuse to actually do it.
I must say I feel awkward now, and I still don't know if I will be able to keep this resolution.
As for the new copyright file format, with full licensing information and copyright holders list, I *did* try, on a significantly smaller piece of software than the mozilla packages, namely on Webkit, which is not really small either but still 6 times less files than xulrunner. I must say I hate to have to list copyright holders and file names with a passion, and the amount of time it takes. It is the main reason why there wasn't more uploads of WebKit svn snapshots in the archive...
Last but not least, thanks for the nice comments.